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The noise cancellation effect is more prominent with lower
frequency noise. The noise can be reduced but cannot be
completely eliminated.
There is a chance of noise/interference when a mobile phone is
closer to the unit. In this case, move the mobile away from the
headphone unit to stop the interference.
Covering the microphone of your headphone might hamper the
noise cancelling effect leading to an unpleasant squeaking or
buzzing sound.
