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The Bose QuietComfort 25 does not use a rechargeable battery, but instead opts to use a single AAA battery to power the active noise cancellation Though this may seem decidedly lastdecade to some people, throwing a few AAA batteries in your bag is easy (the included case even provides a slot for an spare battery) and means you can replace the battery as needed rather than plugging the headphones in to chargeThe QuietComfort 25 Acoustic Noise Cancelling headphones instantly process the noise signal, and a precise equal and opposite signal (correction signal) is created This opposite signal is then sent to the speaker in the earcup along with the sound the user wants to hear (again, this could be music or silence)QuietComfort 25 Acoustic Noise Cancelling headphones are the best performing around ear headphones from Bose They give you crisp, powerful sound and quiet that lets you hear your music better Bose advances their industry leading headphones with the latest proprietary Bose Active