▷Make sure that the headphones are switched on (> Switching the headphones on).
To activate the active noise cancellation ANC:
▷Press the on/off button 1x.
If you are using Bluetooth:
The LED flashes purple 3x.
If Bluetooth is deactivated (analog audio cable is connected, > Using the audio cable/activating flight mode):
The LED lights up blue.
ANC is activated.
To deactivate the active noise cancellation ANC:
▷Press the on/off button 1x.
If you are using Bluetooth:
The LED flashes purple 3x.
If Bluetooth is deactivated:
The LED goes off.
ANC is deactivated.