The speaker usage time will vary according to the volume and song, Playing loudest and playing heavy bass songs will speed up battery consumption. Binygo recommends that 1992 speakers should be adjusted to a medium volume for listening, this will maintain the best silver and battery performance. Power bank function, when turned on, you can pass. The USB port of 1992 speakers can be plugged into the charging cable of the device to charge your device in an emergency. TWS series function, you can connect multiple speakers wirelessly in series to form an immersive surround sound effect. In TWS mode, you can use the DSP button to switch the sound effect. 1992 speakers are equipped with 16-level volume settings, allowing you to find more comfortable volume settin. When the call is coming, you can connect or hang up the call by short pressing the play button.