Key FeaturesCompact, on-ear design Technology innovations enable QC3 on-ear headphones to give you same level of acclaimed performance as our QC2 around-ear headphones.Acoustic 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.Custom rechargeable lithium-ion battery Enjoy approximately 20 hours of reliable run time with this convenient rechargeable battery. Small wall-socket charger also included. SpecificationsOverall headphone dimensions: 7 3/8 inch H x 5 inch W (19 cm x 13.5 cm)Ear cushion outside dimensions: 2 7/8 inch H x 2 inch W (7.5 cm x 6 cm)Weight with cable: 5.6 oz (159 g)Battery output power: 3.7VDC, 200mAhBattery life: Approximately 20 hours Includes1 pair of headphonesDetachable audio cable5-foot extension cord1/4-inch stereo-plug adapterDual-plug adapterRechargeable batteryAC battery chargerCarrying case QuietComfort 3 Acoustic Noise Cancelling headphones deliver acclaimed Bose performance in a new on-ear design. Just slip them on and experience the difference our proprietary technologies make. Enjoy full-spectrum noise reduction that fades background distractions. Rich, clear audio that reveals nuances you might have missed. And a compact, lightweight, easy fit for hours of comfortable listening. It's a unique combination of benefits available only from Bose, and now yours with QC3 on-ear headphones. Hear the difference for yourself Wear QC3 headphones when you fly, and you'll notice a dramatic decrease in engine roar?the moment you turn them on. The cabin becomes more peaceful; you can hear yourself think. Use the detachable cord to connect your MP3, DVD or CD player, or to listen to the in-flight movie. You'll hear audio detail and clarity you may have never experienced before. Wear QC3 headpho