The battery is indeed good. The sound has a lot of treble and it pierces your ears. If you lower it so that it doesn't bother you, it doesn't sound satisfactory. If you don't speak directly into it (which is difficult while driving), the other person can't hear you at all. Bad purchase

+ The battery is satisfactory. It lasts for a few days, depending on usage. I don't have it constantly on, but since it's Bluetooth 4, it's not very power-consuming.
+ The speaker is satisfactory and quite clear.
+ It connects quickly, and I haven't noticed any disconnections.
+ It's not just for calls. It reproduces the sound of the connected device (music, movies, etc.).
- The microphone is unacceptable. At first, I couldn't be heard properly. Then, I enlarged the hole of the microphone with a screwdriver on the side, and it's better now. The ideal situation was when I completely removed the microphone from the casing and left it outside. Initially, it was terrible. No one could hear me