The noise cancelling circuit actually senses outside noise with built-in microphones and sends an equal-but-opposite cancelling signal to the headset.

Note

• The noise cancelling effect may not be pronounced in a very quiet environment, or some noise may be heard.
• The noise cancelling effect may vary depending on how you wear the headset.
• The noise cancelling function works for noise in the low frequency band primarily. Although noise is reduced, it is not cancelled completely.
• When you use the headset in a train or a car, noise may occur depending on street conditions.
• Mobile phones may cause interference and noise. Should this occur, locate the headset farther away from the mobile phone.
• Do not cover the microphones of the headphones with your hands. The noise cancelling function may not work properly.

A: Microphones