Key FeaturesAcoustic Noise Cancelling headphones Proprietary Bose technology electronically identifies and reduces unwanted sound while faithfully preserving the audio or tranquility you desire.TriPort acoustic headphone structure Exclusive technology features tiny ports in the earcups to produce a rich audio performance.Overall headphone dimensions: 7 and three quarter inch H x 6 and one half inch WEar cushion outside dimensions: 3 and four fifths H x 3 inch WWeight with cables: 6.9 oz. Package Includes1 pair of headphonesDetachable audio cable5-foot extension cordOne fourth-inch stereo-plug adapterDual-plug adapter1 AAA batteryCarrying case Experience the innovative combination of our acclaimed noise reduction technology and headphone audio performance with QuietComfort 2 Acoustic Noise Cancelling headphones. QuietComfort 2 headphones help reduce unwanted distractions and make what you want to hear sound even better. Ergonomically designed for a comfortable fit. Fold-flat feature makes storage in the slim carrying case easy. Why hearing less lets you hear more Slip on a pair of QuietComfort 2 headphones and hear your music come alive. Decades of Bose research combine with our Acoustic Noise Cancelling headphone technology for outstanding audio performance. This award-winning technology electronically identifies and dramatically reduces noise while faithfully preserving the music, movie dialogue or tranquility you desire. TriPort acoustic headphone structure also delivers a lifelike headphone audio performance in a compact and lightweight design. Listening to your favorite music, you may even forget you have them on. For travel, work and home QuietComfort headphones were specifically designed for airline travel, but owners soon told us how much they enjoy using them in other places to reduce distractions: on buses and trains, in the office, even at home. Whether you take them on a trip or to the office, today's QC2 headphones fold flat and store easily in