You just found a one of a kind mobile party. All you need to do is charge the batteries and plug in your mp3 player. The main sound comes from a set of two amplified motorcycle speakers just off your shoulders. The bass comes from a low-profile amplified 8″ subwoofer. The power comes from a custom 10 cell rechargeable battery belt, size 36. You will easily be the loudest person in the room. The vest comes with a battery charger for the belt and a wire to connect your tunes to the vest. You have independent volume and subwoofer controls on your hip.