Music and other streaming apps:
1. To play/pause a song press the center button once.
2. To skip to the next song, press the center button twice.
3. To go back to the start of the song or the previous song, press the center button three times.
4. To fast-forward through a song, double-click and hold the center button.
5. To rewind through a song, triple-click and hold the center button.
For your camera and other photo/video apps:
6. to take a photo, press either volume button
For phone calls:
7. Free up your hands on a phone call by talking into the built-in microphone.
8. To answer a call, press the center button once.
9. To hang up, press the center button again.
10. To ignore a call, press and hold the center button for about two seconds.
11. To answer a second incoming call and to keep the first caller on hold, press the center button once.
12. To switch between calls, press the center button.
13. To end one call and switch to the second call, press and hold the center button for about two seconds.
14. To ignore a second incoming call, press and hold the center button for about two seconds.
For Siri:
15. To activate Siri, press and hold the center button.
You can find further explanation with photos on www.businessinsider.com.au.