Used by travelers to reduce aircraft engine noise, and by others preferring tranquility in their work, these Bose headphones are renowned for their full-spectrum noise reduction and comfortable fit. Microphones inside the earcups identify unwanted sound and a correction signal prevents the noise from reaching the speakers, ensuring external noise reduction. In addition to in-flight noise, the headphones diminish office distractions, commuter train clatter, and other constant low-frequency sounds without compromising audio quality, allowing you to hear details and nuances of recordings. Bose QuietComfort 3 Acoustic Noise Cancelling headphones have a slim, smaller design that rests directly on the ear, instead of surrounding it, and have soft memory foam to provide a gentle cushion against the ear. Uses a rechargeable lithium-ion battery that runs for 20 hours on a full charge. Folds flat for convenient storage and travel. Includes AC battery recharger, dual-plug adapter, 5' extension cord, and travel case. 7 3/8" H x 5 1/4 " W. (5 2/3 oz.)Available for delivery only in the United States.