The docking station includes 2x 850mAh rechargeable battery packs that clip into your controllers, removing the need to spend money on expensive disposable batteries. The docking station has been aesthetically designed to match your console and gaming set up and also features a front led display that illuminates red when charging and turns green when your controller is fully charged.Fast efficient charging with x2 powerful 850mAh rechargeable battery packs. Drop and go design removes the need to connect fiddly wires.