3. How to use the in-line control of the F3?

A:
Play Music:
Pause/Play: Click the middle button once to pause/play music;
Next Track: Click the middle button briefly twice;
Previous Track: Click the middle button briefly three times;

Phone Call:
Answer/Hang Up: Click the middle button once
Refuse: Hold the middle button

Adjust Volume:
Adjust by clicking the Volume Up or Volume Down button
(*the in-line volume control is not compatible with the Apple iOS devices)