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By pressing the center key once, users can pause playing music or video, press again to play again. In addition, when plugging in the headset then pressing the center key also allows opening the music application without touching the screen.
To fast forward the song, press the center key twice and then hold the key. If you want to rewind the playback, press the center key three times then hold.
Press the center key twice in a row to listen to the next song. To listen to the previous song, press the center key three times in a row.
When a call comes in, press the center key to answer, press again to end the call. To reject the call, hold the center key for about 2 seconds.
During a call, have another call ( call waiting ), press the center key to switch to the new call, press again to return to the old call. If you want to end the old call to receive a new call, hold the center key for about two seconds.
When opening the camera application, iPhone allows using volume up or down keys on the camera body to take pictures. The two buttons on the headset also have the same function.
Also by holding the center key, users can enable Siri assistant or voice command similar to holding the Home key on iPhone.