Hello, buddy! Introduction: This item is compatible with charging For controller.it has 4pcs charge port so it can charge 4pcs controllers at the same time.And it have 4pcs match battery packs.so no need to worry power problem. 1.It can charge 2/4pcs controllers at the same time. 2.It s charging with design of impulse voltage circuit 3.It matched big capacity Ni-MH battery.simple and convenient to use. 4.It s taste.tidiness when you put User Manual: 1.please plug DC5V into input port,power decorate 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 batteries in controller for charging.the light will turn red when it s in charging,after full charging it will turn blue Package 1: 1 x Battery Charger Dock Stand 2 x 2800 mAh Rechargeable Batteries 1 x USB Cable Package 2: 1 x Battery Charger Dock Stand 4 x 2800 mAh Rechargeable Batteries 1 x USB Cable See you next time!