All user interfaces are done through commands on the touch interface. An audio signal indicates when a command is activated (for example, entering pairing mode). 

CONTROLS

To turn on the Hellas headphones:
Power ON: Press and hold the touch interface for 4 seconds
Power OFF: Press and hold the touch interface for 4 seconds.

Once connected to a sound source via Bluetooth:
PLAY / PAUSE / ANSWER CALL
Single Tap

HANG UP / REJECT CALL
Double Tap

PREVIOUS SONG
Swipe Backward

NEXT SONG
Swipe Forward

DECREASE VOLUME
Swipe Downward

INCREASE VOLUME
Swipe Upward