Wolfson Microelectronics Digital Silence DS421D Premium Stereo Headsets with three selectable ANC modes that allow users to optimize the noise cancellation performance for their specific environment. This brand new active ambient noise cancelling headset offers three user-selectable Wolfson myZone ANC modes: General / Airplane / Office. The Digital Silence DS-421D headset is also fitted with a Wolfson WM7130 MEMS microphone in each ear bud to pick up the ambient noise around the user prior to cancellation. It features 14 hours of HD audio playback for high quality music and will continue to function as a normal headset even if the battery does run out. Perfect for the busy professional living in the different environments of everyday life, the stylish Digital Silence DS-421D headset is designed specifically for mobile users.