Cables Unlimited Hardcore Gaming Dual Remote Induction Charging System for Wii: Elegant slim board design, compact and space free With special electromagnetic induction No contact terminals necessary Intelligent functions, just place and recharge, no bad contact consideration Extend battery packs life Get power from Wii adapter directly by T-shape extension cable Rapid charging time, full charge is under 3.5 hours Dual color LED to indicate the charging status The rubber oil which is sprayed on the hand-grip of the battery pack is to enhance the function of hand-feel and anti-slip With circuit protection design to avoid over-voltage, over-current, over charging and over heat Built-in timer design, charging current will stop automatically within 6 hours With PTC fuse in rechargeable battery pack to avoid short circuit, over current and over heat CE, FCC certified, RoHS compliance Patents and copyright pending