This item is compatible with charging for Wii controller. It has 4pcs charge port so it can charge 4pcs controllers at the same time. And it have 4pcs match cell packs. so no need to worry electricity problem. Specifications: Color: White Package Weight: 306g / 10.79ounces Package Size: 200 * 100 * 55mm / 7.87 * 3.94 * 2.17in User Manual: 1. Please plug DC5V into input port, light is blue (If you no need decorate light, please turn switch to “off”. If you need. turn to “ON”) 2. Please put 1-4PCS matched cells in controller for charging, the light will turn red when it’s in charging, after full charging it will turn blue. Package List: 1 * Cell Charging Stand     4 * 2800mAh Rechargeable Cells     1 * USB Cable（Wii Remote controller not included）