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It is the reduction of unwanted low frequency background noise by use of an electronic circuit.
You can turn this feature off or on to suit your preference.

It is a built in feature into a headset that activates light if you are on a call, or if you self-activate it, to let others know you are busy.

You need to activate the Active Noise Cancellation feature on the headset by sliding the ANC switch to ‘ANC ON’. With ANC on, you’ll experience a reduction in background noise such as air conditioning.