Sony MDR-NC6 Noise Canceling Stereo Headphones

The Sony MDR-NC6 noise-cancelling stereo headphones feature an active, ambient sound-synthesizing circuit that significantly reduces lower-mid noise by over 10 dB at300 Hz. The circuit, powered by a conventional "AAA" battery, may be switched on or off, enabling usage at home as standard stereo headphones. The comfortable, padded headphone earcups offer a swiveling design, and an in-flight plugadapter is provided for airplane music service listening. The MDR-NC6's represents a versatile listening alternative in a very moderate price range. Key Features  Noise-cancelling stereo headphones withswiveling earcups  10 dB of lower midrange ambient noise reduction at 300 Hz  40 Hz - 1.5 kHz noise reduction range  Ambient sound is synthesized with anti-sound signal produced by active,AAA battery-powered noise canceling circuit  Active or passive headphone operation with on/off switch  Neodymium magnet, 38mm diameter driver unit for higher output and improved dynamic range  In-flight music service plug adapter for airplane listening