Noise from computers, passing cars, fans and even lamps buzz right through ordinary headphones, interfering with the pleasure of a complete musical experience. The remarkable Heil Noise Cancelling Headphones with Quiet Phone™ noise canceling technology actually cancel out annoying ambient noise, leaving you with clear, high quality audio like you've never heard before. Amateur radio operators rely on Heil's noise-canceling technology to ensure that they can hear communications clearly. You can use this same technology to create your own quiet comfort while listening to music at home, on a plane, or while taking a break at work. The headphones are lightweight and fit easily into the optional leatherette carrying bag. Experience the soothing, Heil Noise Cancelling Headphones with pocket radios, CD players, MP3 players, or DVD players. Wonderfully cushy leather-like pads cover the speakers. Requires (1) "AA" battery (not included).