volume up:
raises volume
multi-function button:
press once to play/pause or answer/end a call
press twice to track forward, press 3 times to track back
press and hold to ignore an incoming call
volume down:
lowers volume
volume up:
raises volume
multi-function button:
press once to play/pause or answer/end a call
press twice to track forward, press 3 times to track back
press and hold to ignore an incoming call
volume down:
lowers volume