These advanced headphones give you 900MHz wireless freedom never before imagined! Walk around the room, to other rooms, or most anywhere in the house & the sound quality stays the same with the Auto Tuning feature. And it can be used with any piece of audio / video equipment with headphone connections! Extended reception range of 164 feet New Voice Call Function for convenient communication Easy rechargeable system Includes - connection cord, AC adaptor, rechargeable batteries, & plug adapter. High quality sound with large 40mm driver unit.