Fast charge version: [One minute fast charge + noise reduction call]

With warehouse version: [Long standby + charging speed up to 80%]

Function: turn on/off, long press for 3 seconds
Summon Siri, double-click the power button
Play/pause, click the power button
Volume increase and decrease, long press "+" to increase the volume, long press "-" to decrease the volume
Switch between upper and lower songs, click "+" previous song, click "-" next song
Last number redial, triple press the power button
Answer/hang up, short press for 1 second for incoming call/call