Can get all controllers to charge at the same time. Its charging with design of impulse voltage circuit. It matched large-capacity Ni-MH cell. Can turn on LED light to show the batteries charging status. The light will turn red when its in charging, when fully charged or not charging it will turn blue. (If you don't need LED light, please turn switch to off) In order to be in good contact with the charging dock, please make sure place the charging station on the flat surface. Simple and convenient to use. Tidiness when you put. This item is compatible with charging for Wii controller. It can charge all controllers at the same time. Features: Can get all controllers to charge at the same time. It's charging with design of impulse voltage circuit. It matched large-capacity Ni-MH cell. Can turn on LED light to show the batteries charging status. The light will turn red when its in charging, when fully charged or not charging it will turn blue. (If you don't need LED light, please turn switch to off) In order to be in good contact with the charging dock, please make sure place the charging station on the flat surface. Simple and convenient to use. Tidiness when you put. Specifications: Color: White, Black Package Weight: 2 dock type: 211.6g / 7.46ounces, 4 dock type: 360g / 12.7ounces Package Size:2 dock type: 138 * 98 * 48mm / 5.43 * 3.86 * 1.89in, 4 dock type: 204 * 100 * 55mm / 8.03 * 3.94 * 2.17in User Manual: 1. Please plug DC5V into input port, LED light is blue (If you don't need decorate light, please turn switch to off. If you need. turn to ON) 2. Please put 1-4PCS(2 dock type: 1-2PCS) matched cells in controller for charging, the light will turn red when its in charging, after full charging it will turn blue. Package List: 1 * Cell Charging Stand 2/4 * Rechargeable Cells(Optional 1 * USB CableWii Remote controller/Adapter not included