* Listening to music
Play/Pause : press the button on L/R once in short
Next Track: Press the button on L/R twice in short
Previous Track: Press the button on L/R three times in short

* Calling
Answering a call/Ending a call: press the button on L/R once in short
Rejecting a call: press the button on L/R once in short

* When using Dual Mode, the sound can be heard from both left and right earphones during calls.
* In Single Mode, each earphone will output sound with both microphones enabled for use.
* Press and hold the multifunction button for 1 second to launch the voice recognition feature of your smartphone or tablet.
(Android OS : Google Assistant / iOS : Siri / Window OS : Cortana - Except during calls)