Double-tap
Music / standby: skip to the next track
Call: answer an incoming call
Triple-tap
Music / standby: skip to the previous track
Call: reject or hang up the call
Tap and Hold
Switch between Active Noise Cancellation and Transparency Mode
For more options, use the Nothing X app.
Optional functions include: play/pause, skip forward, skip back, toggle noise cancellation modes, volume up, volume down, and wake up the voice assistant.