These Acoustic Noise Cancelling headphones from Bose 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. The headphones are ideal for reducing external noise from aircraft engines, commuter train clatter, and other distracting sources without compromising audio quality, allowing you to hear details and nuances of recordings. The slim, smaller earcups rest 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.)