This unit is equipped with a function that automatically reduces output when the battery voltage drops (Power Save Mode).

If this unit enters the Power Save Mode while in use, a short beep sound is emitted, and one of the left indicators will start flashing. The volume will also be lowered automatically. This is not a malfunction.

After fully charging the unit with the power turned off, the volume will be restored to its normal level when the power is turned on again.