Using the Microphone Control: 
One click: To answer or end a call. Press and release the center button once to answer. Repeat to end the call;
Two clicks: To skip to the next song. Press and release the center button twice quickly to skip forward'
Decline an incoming call: Press and hold the center button for two seconds, then release. There will be two beeps when you let go to indicate sucessful operation
Play or pause a song or video: Press and release the center button. Repeat to resume