V-MODA S-80 On-Ear Bluetooth Headphones and Personal Speaker System (Rose Gold) - Manual (Page 15)

LOUD MODE
Press and hold "MULTIFUNCTION" and "+" at the same time for 3 seconds
Note: Do not use it on your ears when S-80 is in a Loud Mode to protect your ears.
For safe use, S-80 volume turns up when the ear cups are facing forward.
When ear cups are positioned back to headphone position, the volume turns down.
*Equalizer setting will be "HEADPHONE"
To turn back to normal volume mode (LOW MODE)
LOW MODE
Press and hold "MULTIFUNCTION" and "-" at the same time for 3 seconds
*When S-80 power is turned on, it is set as a Low Mode.
Loud Mode
Low Mode
Press and hold "MULTIFUNCTION" and "+" at the same
time for 3 seconds
Press and hold "MULTIFUNCTION" and "-" at the same
time for 3 seconds