Cables Unlimited's Wii Dual Remote Induction Charging System with Rechargeable Batteries. Charging method by electromagnetic induction, no contact terminals necessary. It comes with special electromagnetic induction battery packs. There is no need to remove silicone case out of Wii remote controller. Two charging docks support to charge Wii remote controller directly or battery pack alone. It allows to charge Wii remote controller with or without Wii MotionPlus.