How to use the A.N.C. button
The active noise cancellation (A.N.C.) can be used to reduce environmental noise while listening to music or when Bluetooth is deactivated, for added peace and quiet.
Slide the button located on the right side of your headphones to switch A.N.C. On or Off.
Upwards (Yellow dot) : ANC ON
Downwards (red dot) : ANC OFF
Note:
Make sure ANC is set to OFF when you're not using the headphones, to save battery power.