Bgjoy Music Beani features bluetooth speakers inside of the beanie.They are removable so the hat can be washed. The inside of the hat is very warm, keeps you warm and cozy. The battery for the headphones is rechargeable and lasts up to about 6-7 hours. It is easy to use with three main buttons on the side of the hat. There is a microphone built into the speakers, which allows you to make phone calls hands free.