GENNUM 5000 - Manual (Page 11)

11 Quick Start
TM
To Decrease Volume
Press and release the volume control (-) button for slight volume decrease.
Press and hold down the volume control (-) button for continuous decrease.
You will hear a single beep on your headset when you have reached the top or
bottom of the volume range.
Switching Volume Control Buttons
The headset volume (+) control is the top button for a right ear fit. The volume
control (+) button can be switched when you wear the headset on your left ear.
To Switch Volume (+) and Volume (-) button controls
Press both buttons at the same time until your headset plays a ‘volume switch
successful’ melody.