Customer Ratings & Reviews

I’ve been using this Ember tumbler every day for work and it’s awesome. My coffee stays hot for hours without that burnt taste you get from reheating. The setup was super easy, and it connects to my phone so I can pick the exact temp I like. The design feels solid and looks really nice on my desk. I usually charge it once a day and it lasts through my whole shift. The lid seals well, so I can toss it in my bag without worrying about spills. It’s definitely on the pricey side, but if you drink coffee slowly or get distracted during the day, it’s totally worth it. Once you try it, you won’t want to go back to a regular mug.

Ember: Travel Mug vs. Tumbler So I was deciding between the ember travel mug and the ember tumbler and I didn’t find a lot of information to make my decision. I ended up buying both, and like each for different reasons. Ember Travel Mug: -Holds 12oz. Charge lasts about three hours -Has (sold separately) travel charger that plugs into car charger (formerly cigarette lighter). This travel charger is not compatible with the ember tumbler. -interestingly, although the travel charger only works with the travel mug, the travel mug can charge on any Ember coaster interchangeable with the mug or Tumbler chargers -Has display on mug, touch display, that can display temperature, can adjust temperature, and cans display words (nickname you choose in the app). App still functions to change temperature the same way other ember mugs do. -almost too skinny for my cars cup holder -I have the travel mug that does not have the apple location built-in, but keep in mind that the Apple location in the Find My app is similar to an AirTag meeting. It works with Bluetooth within so many feet of the cup rather than GPS so the travel mug can be located in the Find My app as long as it is within Bluetooth range so basically if you’re in the same room as it if you leave it at a coffee shop or something it will NOT show up on your GPS Map in the Find My app Ember Tumbler: -Holds 16oz -Charge lasts about 3 hours -Cannot charge on the Ember travel charger -has a single LED that is not touch responsive the LED acts, the same way as the regular mug, giving a white flashing light when adjusting temperature the solid white light when temperature is reached and various other indicators for charging and out of battery and personalized color that can be chosen in the app -fits securely enough in my car cupholder although it doesn’t go all the way to the bottom it holds securely and does not tip over I drive a somewhat small vehicle Ford C-MAX hybrid 2015 and I feel like I have pretty standard cupholder sizes Overall, I get more use out of the Tumbler because it holds more, but the travel mug is better for trips because of the car charger and I can refill it at gas stations with more coffee or whatever hot liquid I want.

The Ember mug is a wonderful product that enhances your drinking experience and makes your life easier. It is a perfect gift for yourself or your loved ones who appreciate a hot drink. I only wish that they would make the LED more pronounced, I can hardly ever see it.

Purchased this for my wife for Christmas and she loves it! I opted for this one over the mug due to the capacity and the fact that she is always on the go. It may be a little big for some cup holders, but it fits hers in her dodge durango and mine in my gmc sierra. So far very pleased!

Overall Great Product. The tumblr worked as it was design and kept my tea at the perfect temperature throughout the day. The battery dont last the whole day so if you use it at work def have a charger to charge it when needed.

Keeps my coffee warm and toasty as 125 degrees. My old one broke so replaced with the tumbler. Works as advertised.

This is the perfect Ember Travel Mug! My husband loves it!

Died after 10 months of part-time use. The product no longer charges. I have run through all the troubleshooting and resetting without success. I can't even find a place to buy a replacement battery. The Ember site does not have a page for replacement batteries.

Perfect size for when I have to go into the office with my own special coffee.

This Ember Tumbler is essentially a 16oz version of the Ember Cup with a few lid choices included. It is their largest-capacity yet at 16oz and has a long-life battery that lasts up to 3 hours away from the charging coaster. It’s a sleek and stylish way to carry around a larger portion of warm beverage without spilling. Highlights: * Ember’s largest capacity yet at 16oz (bigger than their Travel Mug)! * Long-life battery keeps beverages warm for up to 3 hours away from the charging coaster. * Includes an insulated spill-proof lid with handle. * Includes a Sip lid that is easy to clean with a removable slide part. * Includes a smaller charging coaster that still works with all other Ember cups. * Fits most car cupholders. * Fully water-safe for washing by hand. * Lids are safe for the dishwasher. Room for Improvement: * Bottom retains moisture after cleaning like all other Ember cups/mugs. * Unlike the Travel Mug, must use the app to see/change the temperature and check battery level. * Unlike the Travel Mug, must charge on a AC-powered charging coaster (one included) - not compatible with the Travel Mug’s Car Charger accessory. Setup: Like all other Ember cups and mugs, setup is super easy. Wash the Tumbler and lids by hand and then charge up the Tumbler using the provided charging coaster or the charging coster from any other Ember drink ware product (cup/mug/etc.). Once fully charged, open up the free Ember app and choose to add a new product. The app quickly connects to the Tumbler via Bluetooth and shows the temperature set point and Tumbler battery charge level. Now that it is connected to the app, you can personalize the temperature units, temperature presets, and even the change the standby LED color so you can more easily identify similar Tumblers if you have more than one. A firmware update may be needed and if so, is quickly applied. That’s it for setup. Usage: Like the other Ember drink ware products, the Tumbler defaults to a set temperature of 135F so even if you never use the app to adjust the temperature, the Tumbler will hold your drink of choice at a temp that is a good base for coffee or tea. Of course, you can use the app to set it to your temp of choice between 120F and 145F and even customize presets by name. The built-in battery will hold that temp for about 3 hours off the coaster, or almost indefinitely if left on the coaster. I have a few different sizes of Ember drink ware so I have a few of their charging coasters around the house; one at my work desk, one at the dining table, etc.. While the battery keeps things warm while away from the coasters, I tend to put my cup of the moment on whatever coaster is nearby which keeps things warm until it’s time for a refill. The tumbler holds up to 16oz of warm beverages which makes it the largest offering by Ember - more capacity than even their Travel Mug! In fact, the Tumbler to me looks like a super-sized version of the 6oz Cup in design; but with a lid and a bigger battery. You can use it at your desk like a really large coffee mug, but it also comes with two choices of lid. The screw-on lid has a handle and makes it easy to carry the Tumbler and not worry about the lid popping off or anything spilling. There is a rubber gasket to keep it sealed and little holes on the inside portion to make it easier to clean and drain the wash water. It’s also insulated to keep your drink warmer. The Sip lid is a press-fit with a rubber gasket and has a slide to cover the sip hole While it’s not completely spill-proof, it will minimize any messes if the Tumbler is tipped over. On the inside of this lid is a latch to easily remove the slide portion for cleaning. Both lids are dishwasher-safe, but like all of the other Ember cups/mugs, the Tumbler itself is water-safe and fully submersible but should be hand washed only. On the bottom of the Tumbler, again like all other Ember cups/mugs, is a rubber coating to keep it from sliding around, the power/pairing button, and two concentric metal rings that mate with the pins in the coaster to charge up the battery. After years of using Ember cups and mugs, I know that this bottom section tends to collect moisture after being washed, and if you put the Tumbler on the charging coaster immediately after being washed, you’ll end up with moisture under the bottom and in the coaster. To prevent this, I always leave the Tumbler upside down for an hour or so to air dry before flipping it over on its coaster to charge. As mentioned above, the Tumbler is Ember’s largest-capacity product yet. It holds up to 16oz of beverage whereas the Travel Mug only holds 12oz. They both have a 3-hour battery, but the main differences (aside from the 4oz difference in capacity) is that the Tumbler is really designed to work with the app. The Travel Mug, on the other hand, has a display and buttons so that you can control the temperature and see the battery charge level without the app. The Travel Mug also has an accessory charging coaster that plugs into a car’s 12v outlet for keeping it charged up while driving. The Tumbler only works with the standard charging coasters that connect to an AC outlet. Overall: If you’re familiar with Ember cups and mugs, this Tumbler is everything you love about them in a bigger 16oz version with a few lids. This supplements their lineup of 6oz, 10oz and 14oz cups with a new 16oz version and even hold more than their prior 12oz Travel Mug. If this would be your first Ember drink ware product, it may seem pricey for what amounts to a battery-powered coffee cup, but it’s really wonderful to never have cold coffee or tea again - when at home or out and about. That’s why I keep coming back for more Ember products!

The Ember Tumbler looks familiar to me. I've tried some off-brands in the past, so I was excited to try the leading brand in this technology. There are a few things that are important to me when it comes to drinking my coffee, and I’ll outline them below: How much can it hold? This tumbler holds about 16 ounces, and more importantly, it fits under most standard coffee makers. I've had a few that didn’t fit, and 16 ounces hits the spot. It’s enough coffee for my mornings at work, and I can set it right under my coffee maker and fill it up. What temperature does it heat up to? The Ember Tumbler hits the sweet spot here. I have a competing mug that gives me 135, 140, or 145 degrees. The Ember tumbler lets you choose 120 to 145 degrees, one degree at a time as long as you're using the app; otherwise, it defaults to 135. This might not sound important, but believe me, you’ll find the perfect temperature in this range. I typically choose 135, but now that I have options, I’ll actually scoot down to about 130. What’s nice is it will hold it right there for you, as long as you can drink your coffee in 3 hours or less, and to me, that’s not a problem. How does it feel in your hands? It’s close to the perfect weight and size. It also has a slightly textured finish to avoid any slips. It weighs about a pound and sits a little over 6 inches tall. I would say they nailed the design. It comes with two lids, a handle lid, and a sipping lid. They both fit well. The sipper is fairly easy to drink from, although I prefer to sip with the lid off. How is the app? I downloaded this to both an Android phone and an iPhone. I did have a minor hiccup with the Android app. It might have been my phone, not sure, but I uninstalled and reinstalled, and I was up and running. The app has a clean and simple interface. Most importantly, the app lets you choose your temperature, and it also gives you a few features such as temperature, battery life, and allows you to personalize the LED color on the mug. You can also choose whether you want to use Fahrenheit or Celsius. Additionally, you can conveniently turn the heater off if necessary. It will also send you notifications once you have arrived at the correct temperature. Is connecting easy? Yes. Connecting was easy with Bluetooth. You simply hold down the button on the bottom of the mug for around 7 seconds; it will start blinking blue, and the app navigates you through connection and setup. It will use a red LED when it needs a charge, and I chose a green LED which will light up once it has reached its temperature. When it’s heating or cooling to temperature, you will see a flashing white LED. What are my thoughts? It’s a great design, and I can’t think of much I would improve. It might be cool to have more colors available, or to offer some more personalization on the tumbler with your name. The charge time seems to be around 2 hours to reach a full charge, so that could improve a little. The Ember Tumbler is a good size and feels good in the hand. It fits any standard cup holder in the car and maintains a 3-hour charge. I like that you can get down to 120 degrees, because in my opinion, 120 to 130 is a good temp for my coffee, although some might like it all the way up to 145. Some might say you should just use an insulated cup that holds temperature for longer. The difference is the Ember will hold the EXACT temperature for up to 3 hours. It’s great for walking out in colder weather, but it’s also convenient on my desk at work. I would highly recommend this mug for your daily driver. I'll give it 5 stars because of the temp choices, size and weight, an app that looks good and delivers only the features you need, and a 3 hour charge time.

This caught my attention as I’m the type of person who usually finds themselves drinking cold coffee after getting distracted in the morning. While I don’t often travel with coffee, its appeal was still immediate. It does it’s main function well - keeping your drink warm (or even increasing heat) for a much longer period of time. Despite this being a tumbler and ready to throw in a bag and go on an adventure, I often find myself using it while working indoors. With the charging base set up at my desk, it never runs out of charge and my coffee is always warm until it's out. Unlike their mug offering, which typically would be best suited for someone like me, the tumbler lets me pick it up and take with anywhere a bit more easily, both inside and out. It also holds the most coffee of any of Ember's offerings. Before actually getting my hands on it, I didn’t really internalize that not even a regular tumbler has a heat profile like this. Normal insulated tumblers will lose heat at a constant rate, but Ember’s keeps your drink steady (for 3 hours at least.) But is it worth the cost difference? - I’d say yes and no… it really depends on your needs. If you already enjoy your drinks hotter, this may have a real benefit to you. As for the build quality and 2 included lids - all is fantastic. The tumbler is a nice powder-coated stainless steel in an attractive matte black finish. Both lids are thick and durable, but minimal in design. This sip lid slides in without threads and feels secure with just the right amount of grip from the silicone gasket. The handle lid secures thought a minimal, partial threading on the inside of the tumbler. Similarly, it is well secured and I’ve never felt that it would loosen itself unintentionally. While this doesn’t have buttons or a true read-out like Ember’s travel mug, it gains a larger 16 oz capacity as a result. Honestly, I’m fine that it’s not here. I’m the type of person who always prefers their drinks around the same temperature, so I simply set it once in the app and never have to think about it. The app itself works well, with a simple readout and notification (if you want them) of when the target temp has been reached. The only thing I find slightly confusing is determining when the mug is charging vs heating. When liquid is inside, it seems to always heat while on the stand. When empty, it simply says ‘empty’ but the temp setting remains. I’m confident that it doesn’t heat in this state - (especially since the screen is shown in grey instead of red) but I wish it were a bit more explicit in it’s communication/messaging. As others have mentioned, the onboard LED is a bit hard to see, regardless of its brightness setting, simply due to it being so low on the tumbler. Ultimately that’s not a biggie, and I understand that as simply being another small tradeoff of keeping all of the battery and electronics concealed at the very bottom of this tumbler, by design. Overall, I really like this. It’s straight to the point and does what it’s supposed to do, without a lot of extra bells and whistles. I enjoy the larger capacity (after all, you’ll get more use of the heating feature when drinking over time) as well as the thoughtful minimal design.

As an avid coffee drinker, I have been waiting for an opportunity to use one of these Ember products for a while now, and it did not disappoint. The 16 oz size and the wide opening make it easier to clean than my old travel mug. The big draw, of course, is the ability to fine tune the drink temperature. I like my coffee on the hot side, and appreciated that I could easily bump up the temperature a few degrees from the app after adding cream to it to get it to my desired temperature. The app is intuitive and works smoothly on my Android. Being able to change the resting LED color from the app is a nice addition as well. The build quality is really solid. The powder coating feels like it will hold up for a long time, and the mug itself feels like it is made from very durable metal. The glossy lid simplifies cleaning, which is a plus. The rubber seal, instead of a twist top, ensures a tight seal. The battery lasts for multiple hours, which is more than enough time for me to finish off my coffee each day without it cooling down. The charging stand is low profile and its design allows for the mug to charge when it's placed in the charging cradle throughout all 360 degrees of rotation. Admittedly a personal preference, but it's a bit bulkier circumference-wise than I'd prefer, and is not as easy to grip as my other travel mugs. Also, it doesn't fit well in any of the car cupholders in either of the cars in our household. Overall, I am very happy with this mug and its app. It has been a worthwhile upgrade, and I am looking forward to putting it through its paces in the upcoming midwest winter.

The Ember Tumbler mug has quickly become an indispensable product of my daily routine. As someone who loves coffee and values both form and function, this 16 oz smart mug has exceeded my expectations. First, the design of the Ember Tumbler is truly impressive. The Black matte finish gives it a modern and understated look that seamlessly blends with any setting and also provides a comfortable grip and insulates so it's never hot to the hand. What sets the Ember Tumbler apart is its smart technology. The ability to control and maintain the temperature of my coffee through the Ember app on my smartphone is really slick. Whether I'm indulging in a hot coffee during a work meeting or sipping on some hot sake for a night cap, the Ember Tumbler ensures that my drink stays at the perfect temperature from the first sip to the last drop. The 16 oz capacity is just right for my daily coffee needs, and the spill-resistant lid adds an extra layer of convenience, along with the handle cap to carry when I'm on the move. The Tumbler's battery life is impressive, easily lasting through my first two coffees of the day. Overall, the Ember Tumbler has earned its place as my go-to coffee tumbler. Its stylish design, smart technology, and practical features make it a must-have for anyone who appreciates a perfectly hot drink, wherever you go.

The Ember Tumbler 16oz is a sleek and tech-savvy addition to the world of travel mugs, blending innovation with practicality. Designed to keep your beverages at the perfect temperature, this smart tumbler caters to both coffee aficionados and tea enthusiasts. While it offers several commendable features, it's not without its share of shortcomings. Design and Build Quality (4/5 stars) The Ember Tumbler boasts a modern and minimalist design, fitting seamlessly into any lifestyle. The stainless steel construction not only adds a touch of elegance but also ensures durability. The matte finish, however, tends to show fingerprints, affecting the aesthetic appeal. Temperature Control (5/5 stars) The highlight of this tumbler is its ability to maintain your drink at the desired temperature through the Ember app. The range of temperature settings is impressive, allowing users to customize their experience. The quick heating function is a game-changer for those who can't wait to savor their hot beverage. Battery Life (3/5 stars) While the Ember Tumbler offers decent battery life, it falls short for users who require extended use throughout the day. The need for frequent recharging can be inconvenient, especially for those constantly on the move. A longer-lasting battery would significantly enhance its practicality. App Integration (4/5 stars) The Ember app provides a convenient way to control the tumbler's temperature settings. However, occasional connectivity issues have been reported, disrupting the seamless user experience. This was not the case during my time with the Ember Tumbler. The app and connectivity seemed spot on. Improved app stability would enhance the overall usability of the product. Cleaning and Maintenance (3/5 stars) The Ember Tumbler's disassembly for cleaning is straightforward, but the intricate components can be challenging to clean thoroughly. The lid, in particular, requires careful attention to prevent residue buildup. A more user-friendly design for cleaning would be a welcome improvement. Price Point (3/5 stars) While the Ember Tumbler delivers on its promise of temperature control, the hefty price tag may deter some potential buyers. The advanced technology justifies the cost for tech enthusiasts, but budget-conscious consumers may find it hard to justify the investment. Overall Rating (3.5/5 stars) The Ember Tumbler 16oz is a commendable fusion of technology and functionality, offering an elevated drinking experience. Despite its notable temperature control capabilities, the product falls short in battery life, app integration, and cleaning convenience. If you prioritize cutting-edge features and are willing to make a significant investment, the Ember Tumbler could be your perfect companion. However, for those seeking a more budget-friendly and hassle-free option, alternative choices may better suit your needs.

When people get the black Ember Tumbler 16oz, they will definitely drink in a different way. This tumbler is a great example of both quality and new ideas. It's very helpful and looks great. Let's start by talking about how it looks. You can use it at work, in a coffee shop, or on the go. The matte black finish makes it look classy and up-to-date. This item not only looks good, but it also makes your everyday life more stylish. But what makes magic real is how well it works with technology. The Ember app and mug let you watch over your drink and make sure it stays at the right temperature. Your coffee, tea, or any other drink would stay at the temperature you set for hours. Enjoy every sip as if you had your own cook or coffee maker making sure it's always perfect. It's just right. You can set the temperature for your favorite drinks in the app so you don't have to do it every time. You can make things easier by telling the app when your drink is ready. That way, you'll never miss the best time to enjoy it. It's also useful, which is an added bonus. With the spill-proof lid, you don't have to worry about taking it to work or carrying it around. It can also keep the temperature steady even if you move around. At first, the Ember Tumbler might seem a bit pricey, but it is well worth the money because it is well-made and easy to use and gonna lasts a long time and has latest tech built into something that looks like a very premium useful beverage accessory. It's also easy to clean—just wash it by hand, and it will stay in good shape. It's also made of strong materials, so you won't have to buy another one soon. It's going to last a long time. The Ember Tumbler is a cool, unique, and smart way to make sure your drinks are always nice and hot. It looks good, works well, and is very high-tech, so anyone who wants to drink better needs to have it.

----- SUMMARY ----- Verdict: The Ember Tumbler is a modern and stylish gadget that offers a great deal of convenience. It’s designed to be safe for submersion in water and comes with dishwasher-safe lids for easy cleaning. The most impressive feature of this tumbler is its temperature control ability. Although it may initially lose heat faster than some competitors, it excels in maintaining the ideal drinking temperature for hours, ensuring that you never have to suffer through lukewarm coffee again. However, the Ember Tumbler is a high-end product with a significant price tag. It’s a luxurious upgrade rather than a budget-friendly option. If you value consistent warmth, convenience, and a touch of tech-infused fun, it is a worthwhile investment. If you’re merely looking for a good tumbler, there are more affordable options available. Pros: - Sleek, minimalist design - Two leakproof (and dishwasher-safe) lids included - Easy-to-clean stainless steel - Compact and unobtrusive charging coaster - Maintains your ideal drinking temperature - Mobile app allows for personalized settings - Customizable LED beneath the Ember logo - Handy notifications - Battery life becomes practically limitless when placed on the charging coaster Cons: - Battery life is only 3 hours on a single charge - Might lose its initial heat slightly faster than some other stainless steel tumblers - Not everyone shares the same sipping pace, so the battery life might not be enough for some people - Pricey compared to other tumbler alternatives ----- DETAILS ----- Design: The Ember Tumbler is a sleek and functional beverage container. It has a minimalist design and can hold up to 16 ounces of your favorite warm drink. The tumbler is made of stainless steel, which is easy to clean and can be submerged in water for thorough cleaning. There are two leakproof lids included: one can be used as a handle for easy carrying, and the other slides smoothly shut for secured sipping. Both lids are dishwasher-safe. Additionally, the compact charging coaster is included, making it a perfect desk companion to keep your coffee or tea at the ideal temperature throughout your workday. Performance: Although the Ember Tumbler may lose its initial heat slightly faster than some other stainless steel tumblers, it excels in maintaining your preferred drinking temperature. In my tests, the scorching brew from my coffee machine cooled down more quickly in the Ember Tumbler compared to another stainless steel option. However, it's not a deal-breaker for me because I prefer my coffee at around 135 degrees, which happens to be the built-in preset of the Ember Tumbler. Once it reaches this temperature, it shines. The temperature stays remarkably consistent for hours, only dipping a few degrees under certain circumstances, such as when I take a walk. Before discovering the Ember Tumbler, I often ended up with lukewarm coffee. I would get preoccupied with tasks and come back to a disappointing cup. Now, my coffee is always perfectly warm, and I can't imagine going back to the inconsistency of my previous tumbler or mug. Mobile App: You can take full charge of your beverage experience with the Ember app. While the Tumbler is great on its own, the app unlocks personalized settings for you. You can fine-tune your drink's temperature to a precise degree between 120°F and 145°F to find your perfect "ah-ha" moment. Additionally, you can add a touch of fun to your every sip by expressing yourself with the customizable LED beneath the Ember logo. The app also keeps you updated with handy notifications, informing you when your desired temperature is reached and when it's time to recharge your tumbler. Battery & Charging: On a single charge, the Ember Tumbler lasts for about three hours. Although some may think this is a short time, it's perfect for me. I can finish a whole cup of coffee or tea before needing to recharge it. However, my wife likes to take her time with her coffee, so this short battery life doesn't work for her. But the Ember Tumbler has a feature that solves this problem - just place it on the charging coaster and it will never run out of battery. You can brew a whole tumbler of coffee in the morning and enjoy warm sips all day long without worrying about lukewarm coffee. ----- WHAT’S IN THE BOX ----- 1 x Ember Tumbler 1 x Ember Charging Coaster 1 x Power Adapter 1 x Quick Start Guide

The new Ember Tumbler was a much needed upgrade compared to the cup I was using that I would continue to have to keep refilling at my desk and that I could not take with me on the road in fear of spilling while driving. Not only can I put more coffee or tea in the tumbler, up to 16 ounces, but I don’t have to worry about the spills with the convenient drinkable lid that comes with it along with the handle lid for carrying places. It fits perfectly in my hand and in my car’s cupholder and keeps my coffee and tea at the perfect temperature, even up to 135 degrees, and tasting freshly brewed for around three hours without fear of wasting a good cup of joe. It’s also very durable and well made. The smart phone application is very simple to use. You can set the temperature to your liking, save presets and receive notifications on your device. I have been so pleased with both of my Ember cups that I would recommend them to anyone for private use or a great gift for a friend or loved one for those special times of year.

Ember cups have been popular in our office and this tumbler is ideal for commuters. This is controlled by the phone app exclusively (Via Bluetooth). The only control on the tumbler is the on/off button on the base, and a color light indicating state at the edge of the base. The app works flawlessly. It never failed to connect. I also like that it has presets (or add custom ones) and it can optionally connect with Apple Health (on my iPhone) and track caffeine intake. The heater will automatically shut off when the mug is empty. This has worked perfectly so far. It does not however turn completely off: The light and Bluetooth connection remain, but it doesn't seem to use much power at all this way. It can be completely turned off by holding the power button for two seconds. It comes with two lids. This seems to me like an interesting choice. One lid has a handle and locks in. It somehow looks very nice with symmetric curves that just looks very nice. However I personally don't find it very practical because one has to un-screw it to drink from it. The other lid does not lock, it's held tightly by the rubber seal, and there's no handle on it. It has a sliding tab to open and close it. It does not auto-lock, and will leak if the tumbler shakes or falls down with the tab open. It's also the easiest lid when it’s time to clean: Twist the lock from the inside the lid and the tab comes off, all very easy to clean without the need of a brush. Just rinse/sponge and it can be cleaned in seconds. It's a fantastic design on this regard. The tumbler held charge for about 3 hours, exactly as advertised. However, my mail peeve with this is that the insulation is very poor: The outside of the tumbler immediately feels warm when pouring hot coffee or tea on it. Not good, particularly because the heater has to work much harder than with a tumbler with proper insulation. Also the coffee tastes bitter and burnt after the 3 hours because the heater keeps simmering the coffee. With better insulation the beverage should taste good for longer and would be kept warm for longer. Charging is via the included coaster. The coaster is powered by a wall transformer with a barrel plug. The bottom of the mug has two circular contacts that are gold coater for better efficiency. The coaster can be used with other Ember products and the tumbler stays in place. Keep in mind that there is no USB-C charging option. Overall, I like this but there is an issue with the impracticality of the handle lid and the lid that one can drink from does not lock. Then there is the obvious defect that the insulation on the tumbler is very poor. I tend to sip slowly so it's a problem for me, but not so much for someone that drinks it within 90 minutes or so. Also the only wat to charge it is via the coaster. The app is very well designed but there are no manual controls on the tumbler itself.

First off.....I'm a coffee snob. I drink about two of these tumblers worth of coffee a day, and this Ember Tumbler is the perfect size for my routine. It keeps my coffee right at the temperature I’ve configured, so every sip is just right and is compatible with my Ember smart mug charger. I initially worried there might be a metallic taste compared to Ember’s ceramic version, since I own both. After using it for a while, I can confidently say the coffee tastes no different. The stainless-steel interior doesn’t affect flavor at all, and I’m fully satisfied with the switch to metal. The mug fits into my vehicle's cup holder firmly. The option to use a sipping cover or a closed cover is ideal. The only reason I didn’t give it 5 stars is the slightly higher weight compared to the ceramic model, but that’s minor. Overall, a great product for keeping coffee at the ideal temperature all day.