Review on Mouse wireless computer rechargeable / 3 DPI modes (800/1200/1600) Bluetooth + USB 2.4Ghz / RGB backlight / Black by Micha ukasiewicz

There are no instructions, it is not clear how much charge is in the battery. After a few minutes of inactivity, it goes into sleep mode, by clicking any button it wakes up in a couple of seconds. Without instructions, it is difficult to understand the intricacies of the settings, for example, if you hold down all 3 buttons, then the BT channel switches (to which and from which it is not clear) - definitely by trial and error.