So, my initial impression upon first use (actually hearing it) was...WOW. The packaging is very simple, but after opening, I was left wondering where the instructions were. Not finding them, I fiddled with the device, trying to figure out how to turn it on, remove the cap to charge, etc. Upon trying to remove the cap for the initial charge, I almost ripped it off. It's attached by a small piece of silicone/rubber. From the looks of it, you should just be able to push it off from one side with your thumb, much like opening a Zippo lighter. But I have to use both fingers and pull it up from one side.
After getting that done and out of the way, I put it on charge because I could not figure out how to turn it on, assuming it was dead out of the box (which is usually rare...most devices have some charge). While it was charging, I went to throw the packaging away and noticed a very tiny, folded manual hidden up in between the plastic behind the orange part that outlines the features and advertisements.
After letting it fully charge and reading a bit of the manual, I can say, the controls for this are way over-convoluted. To turn it on, I have to hold both the volume up and down buttons simultaneously for 2 seconds. Luckily, it went into Bluetooth sync mode automatically and I paired it to my phone.
Attached it to the collar of my shirt. It's a little weighty, so expect some uncomfort if you are using a regular cotton-style t-shirt. I started up Twitch, just to test the treble and voice quality. I was really surprised! I could hear it loud and clear with no issues (this is a big winner for me, as I do have a minor hearing impairment). Then I turned on Spotify and listened to a few songs. Music sounded equally as good, voices were clear and there was enough bass for such a small device. Pretty happy with it so far. And all of this was with the volume just a hair over half-way (which is also the suggested level according to the packaging/manual).
Given the quality of the voices I'd experienced between Twitch and Spotify, I was eager to really test the Bluetooth call functionality. Called my friend with it and...I could barely hear him. His call quality has always been spotty anyway, between his cell connection and his aging and run down Bluetooth headset. So, my wife called me on her way home from work. I couldn't hear her hardly at all...even after turning the volume up to over 3/4 of the way. I immediately switched it back over to my normal Bluetooth headset, with a sigh of disappointment.
Also, battery life is abysmal. It advertises 3 hours, but in reality, especially when using it some for calls, it's closer to the realm of 1.5 -2 hours. I'll stick to my "other" bluetooth speaker that I normally use for Twitch/Spotify when I'm at work. I may still use this some, but in reality, other than being in a quite environment, such as home, there is no way this can be used "as advertised" for the sporty person. Any amount of background/ambient sound will make the overall volume of this drop significantly.
Personally, I would not recommend this product. Save what you would spend on this, add a little more to it and get yourself a "real" dedicated Bluetooth speaker or, if you need something to take with you, a real headset. This idea is great on paper, but in execution, not so much. Had it had better Bluetooth call quality and better battery life, I'd be more apt to recommend this and I would maybe even use it more myself.