Noise-canceling headphones can reduce ambient sound by 87.4 percent so you can hear more music, and less plane, train or bus and other outside noise. Ideal for work or traveling. Ambient sound is synthesized with an anti-sound signal produced by thenoise canceling circuit, and reduced. Headphones work as regular headphones when you switch the noise-canceling function off or the battery runs dry. Over-the head headphones features a 4.9' cord, neodymium magnets for a powerful sound, stereo mini plug, wide adjustable headband, 38mm dome-type driver, 30Hz-20,000Hz frequency response, 40 ohms impedance and 102dB/mW sensitivity. Slim swivel folding design makes headphones more compact for storage. Headphones include carry pouch and plug adapterto connect directly to a stereo or dual jack of in-flight music services.