Wii SANYO Inductive Charging System Officially Licensed By Nintendo Charges Without Removing Protective Silicone Covers Built-In Charge Failure Detection Functionality Recharges Hundreds Of Times, Using Reliable Eneloop Battery Technology Powered Via Usb Officially Licensed by Nintendo! Compatible with both standard and MotionPlus Wii Remotes Charge without removing protective silicone covers Built-in charge failure detection functionality Powered via USB cable - no wall outlet required