Suunto Aqua Light has three buttons you can use to switch song, adjust volume and answer or end phone calls.
The default button functions are as follows:
press the multifunction button once to start or stop playing the audio
press the multifunction button twice to skip to the next track
press the multifunction button three times to return to the previous track
press the
button to increase volumepress the
button to decrease volumekeep the multifunction button and the
button pressed simultaneously for 3 seconds to switch sound modepress the multifunction button once to answer or end a call
long press the multifunction button to reject a call
press the
button to increase volumepress the
button to decrease volumeYou can customize button functions in the Suunto app. See Button customization.