Customer Ratings & Reviews

While on a trip to a trek in mountain I mistakenly left the lights on and my battery drained out when i got back. It was difficult to get a jump starter cable and to get another car to connect , to get the batter started again. It took 2 hours to find it in remote location. I have been using Rexing dashcam for long and have been happy with them and their quality is great. So when I saw a batter jump starter from Rexing immediately jumped on it. This is great tool to have it handy in car. Extremely simple to just connect, compact doesnt take much space and unlike manual it doesnt need long cables. This just works. Best part is it has air compressor as well. If your tire ever have a puncture you can temporarily fill it up drive to a safe location without damaging the rims, useful for emergency top off. Also with the other accessories can be used to top off soccer balls, bicycles when you take to a park. You can set the PSI and it shuts off automatically when preset level is reached. The torch light is also very bright functional and useful. And you can use it charge your phones through the usb port. Only Con I would say is the air compressor cable connection is little tedious , other than its a great multifunctional tool for car that is a must have.

I was on a long back road the other day and saw a car with a flat tire pulled over to the side of the road and it was extra hot out too. It was at that moment I realized that I don't want something like that to happen to me so I better prepare so I can be safe than sorry. I browsed around for a tire inflator and saw this one and decided to get it since it not only would inflate tires but it also would serve as a jump starter as well. I have unpacked it, charged it and have tested it out so I know how to use it if I have to. I will say after using it and learning it ( which is easy to do ) I am very satisfied. I checked my tire PSI with my tire pressure gauge and it showed 31 PSI, I then plugged in this unit to inflate it up to its 33 PSI suggestion and it did it in no time. I then used my tire pressure gauge again and it was right at 33 PSI, so I know this unit did not over or under inflate it, it did just perfect. I also really like that it has included other tips to use as well so I can use it on other things like bike tires, basketballs, soccer balls, etc. Also it gives options on the unit itself to choose what you are inflating so it does it perfectly. The screen is large and easy to read, the buttons are easy to press and are separated enough so you don't press in on the wrong thing and it makes it simple. The built in flashlight is extra bright and even has a flashing option too, so if you should break down and it's not tires or battery you can use that so others will yield on the road. I also plugged in the jumper cables and I like that it is in my opinion dummy proof. The cable only plugs in one way as it's molded uniquely so I can't mix it up or plug it in backwards. I also like that the positive and negative jumper cables are different lengths as well, that way it stops it from the chance of them hitting each other and creating an accidental spark. The included USB cable did fine charging it as well. The included case it comes in is extra sturdy and holds everything in it a-ok, the one side even has a foam outline to keep it extra snug. I do have one recommendation though which I think is a great idea and that is to get a normal USB to lightning or longer USB to USB-C cable ( depending on what your phone or tablet uses ) to also put in the carrying pouch with the other stuff so if you do need to use it as a power bank for a phone or tablet, then the cable is always there ready to use. Overall though, I am very happy with it and in a strange way hope I never have to use it!

This is a great portable piece of equipment that comes in a very compact and well designed case. Easy to use and comes in very handy for various tasks. Inflater for balls and tires work very quickly. The jump starter feature is so much better than finding jumper cables and getting another vehicle position for jump starting.

Rexing continues to release products at a fair price that are practical and well-made. This is another great tool from them, and something you hope that you never need. I was able to add a couple pounds of pressure to my tires quickly, and the user interface was easy to use, with multiple default settings for bike tires, car tires, and basketball type settings. The jump starter is a great feature as well, but I could not test it. The light on the unit is very bright and the plugs seem well made and rugged. The case is a sort of hardshell plastic with fabric over it, which looks very nice. This will be a permanent addition to my hatch and travel gear for the car, and I will definitely be getting 1 for my sister and another for my parents for Christmas this year. Thanks Rexing for another great product !

I first experienced a Jumper Box when I last needed a jump, and the tow truck arrived with a little box instead of a set of jumper cables as I had expected. Well needless to say, I was blown away by the ease and convenience of it. Being a long time Rexing Dashcam customer, I was delighted to see that they branched out into a totally unexpected product line by coming out with their own dual purpose Jumper Box that has an integrated air compressor as well. Not only that, but it has a pretty bright emergency light and can also charge your phone. Hopefully I won't need it to jump my battery anytime soon, but I've already used it a few times to put air in my tires and pump up some pool toys. And of course I'll have it on hand if I come across anyone who may be in need of a jump. It's so much more convenient to use than having to line up a car close enough to use old style jumper cables. As usual, if it has the Rexing name on it, it's a quality product. Just remember to top up the charge on it every few months, so it's ready to go when needed. I deducted one star because I think it should be a bit more powerful, as in having a higher capacity battery to stay strong through repeated jumps if a car doesn't start on the first couple of tries as sometimes happens.

This is my one stop emergency kit where all the boxes are checkes so don't have to keep multiple gears. It's so compact in size and have all the required functionality in case of emergency. I loved the jump starter part as my car is getting old and it can break down during winter in past.

Really impressed with this jump starter and tire inflator combo. Mine arrived fully charged and was ready to go right out of the box. It’s very easy to use, and the built in light is surprisingly bright, which is a nice feature to have if you ever need it at night or in a dark parking lot. I haven’t actually needed to use it to jump a vehicle yet, but honestly, that’s kind of the point for me. It gives me some peace of mind knowing I have a fully charged jump starter in the car if I ever need one. Having the tire inflator built in is another big plus since it means I don’t have to carry separate equipment. It’s compact enough to keep in the vehicle without taking up much space, and everything feels well thought out and convenient. Definitely one of those things you hope you never have to use, but you’ll be very glad you have it when the time comes.

I have tire inflators; I have jump starters, but this is the FIRST combo of a jump starter and tire inflator Easy enough to use. Be warned that sometimes the plug for the inflator can heat up. This has the standard plastic plug-in for the jumper cables. It's the same as the other jump starters I have. I've had 2 (OTHER ONES) break with that same connection from plugging it in/out so many times. I wish there was a better connector, but that is not specific to this jump starter and affects all the ones I've seen so far. I have about 10 different Rexing items, especially dash cams. I like how they're branching out into other items. Overall, I'm happy with the quality of their items. As with all jumpstarters, it's difficult to get the cables back in the bag when you're done. Pros =Rexing quality =first combo inflator OR jumpstarter that I've seen =includes 4 inflator attachments for blow-ups, paddleboards =you can use this for camping to blow up mattresses =1 USB-A output that you can use to charge devices if you need emergency battery backup for phones or others =includes a USB-C for charging Standard =nice case that is themed =has a light for emergency situations Only con =It doesn't have a % battery remaining indicator, but instead only has the 4-5 bars of battery level

I bought this device to keep in my wife's car in case of an emergency. It will inflate the tires or jump start the car in the event of a dead battery. I like the flashlight too and it's nice that it can be used to charge a phone if needed. It comes in a nice case with several accessories and it was fully charged when I received it. It allows me to worry less when I'm not with my wife and it will pay for itself if or when we ever need to use it. I'm glad to have this device.

This compact jump pack + battery operated air compressor is amazing! It’s got enough juice to jump most small and mid sized engines, and uses the jump-pack battery to operate a small but powerful air compressor as well! I just aired up all four of my tires to 41psi and it was a breeze. Set the mode pr specify the desired psi then press the compressor button and the pump kicks into action automatically turning off at the desired pressure (as well as displaying the current pressure as it pumps). I’d say it took about 30-seconds per tire. The only note about the compressor is that it did warm up a little bit after running for about 2.5 minutes straight (doing all four tires). The manual does specify the unit has an auto-cooldown mode if it heats up too much. It didn’t get hot enough, but I see why they mention it. The battery also features a flashlight and USB power supply modes for powering phones or other devices. Overall I’m a huge fan of this device and think it should be in every car!

Great multi-function device in a handy take-along size. It even comes with its own custom durable carrying case with organizing pockets. The RJ21 is listed only as a 2 in 1 device but it can also be used as a 5v usb power bank, and it’s sized conveniently to take anywhere. I’ve found this and other Rexing products to be of high quality with lasting durability. The RJ21 is no different. Their customer service before and after the sale is reliable also.

Compact and solidly built. The jump starter and 150 PSI inflator in one unit is super convenient, and the digital display is clear and easy to use. Comes with a nice hard case, clamps, hose, and adapters—everything feels well-organized. Perfect size to keep in the trunk for roadside emergencies. Happy with it so far.

I originally bought it as an insurance policy since my x5’s battery is weak. Sure enough, 3 days after I bought it my battery died. I hooked it up and started the engine in one single try! I found besides being a jump starter, it also has an integrated flash light and a tire inflator. Definitely a keeper in the trunk!

I am amazed by the quality of this product, It's best when it's needed and it delivers. I started my old car within no time using this. The tires were completely deflated and this product helped me fill in air in all of those. Thanking you rexing.

I'll be keeping this Rexing 2-in-1 in my trunk as it'll be a life safer if I ever need a jump. It jumped my sedan’s dead battery without any drama. The portable air compressor topped off a low tire in under three minutes flat. The built-in flashlight is bright enough for changing a tire after dark, which is important for an emergency flat situation. The USB port lets it double as a phone charger on long drives. The battery is smaller than some others, but that is exactly why the unit fits in a glovebox instead of eating up trunk space. It can hold several jumps before needing a recharge. The buttons are simple, the housing feels solid, and it does the two jobs I bought it for without fuss.

I bought this mostly to keep in the car for those times when something inevitably goes wrong. I’ve had a portable jump starter before, but having the tire inflator built into the same thing is what sold me on this one. I tested the compressor on one of our cars when a tire was a little low and it worked great. It was nice not having to drive somewhere just to put air in the tire. The whole thing is pretty compact too, so it doesn’t take up much room in the trunk. I haven’t had to use it for a real emergency yet, which is probably a good thing, but I did test the jump starter and it worked without any problems. The flashlight is a nice extra to have as well. I also like that it can charge your phone if you need it. Hopefully I never actually need it on the side of the road, but I feel better knowing it’s there. For what it does, I think it’s a really handy thing to keep in the car and I’m glad I picked it up.

Does exactly what it needs to without taking up half the trunk. Air compressor is fast enough for quick top-offs and the pressure gauge is accurate. Battery capacity isn't massive, so don't expect to jump big engines back-to-back, but it holds a charge sitting in the car and works when you actually need it. Definitely worth keeping around for peace of mind.

This device is a must have. I got one, and I used it to adjust the tires on one of the cars. It’s very easy to use, you just input the tire pressure level for the tires, connect it, and press the button. It stops inflating once the set level is achieved. The flash light also comes handy at night. I haven’t tried the jump start yet. The inflator can be used with balls, bike tires, etc. The size is great, it comes with a decent case, with accessories. It came almost fully charged. Overall, it’s great product.

This thing is awesome! I love that it has a jump starter and tire inflator all in one. Its compact enough to keep in the car and feels like a really solid product. The air compressor works great and is very handy when you need to put air in your tires. Having the jump starter gives me peace of mind, especially when traveling. The display is easy to read and everything is pretty simple to use. Really glad I bought this. For the price, having both features in one unit is a great deal. Highly recommend!

I also really like having the jump-start feature. I haven’t had to use it for a dead battery yet, but knowing I have it with me gives me peace of mind, especially when traveling. I’ve been using the Rexing 2-in-1 Jump Starter and Tire Inflator, and I really like having it in my car. I recently needed to put air in one of my tires, and the inflator was very easy to use. I was able to set the desired tire pressure and let it do the work without having to drive to a gas station. My husband has also used the charging feature on his motorcycle, and he was very impressed with how convenient and useful it was. He really liked having a portable charger available when he needed it. It’s compact, easy to store, and having a tire inflator, jump starter, and charging capability all in one device is extremely convenient. So far, we’re both very happy with it and would definitely recommend it. I think it’s something everyone should keep in their car for those unexpected situations I’ve also been using several Rexing dash cameras for years, and their support team has always been very helpful whenever I’ve needed assistance. Just recently a problem with one of the camera turning off .We found out that the issue was caused by a bad microSD card.