4 Port Charging Station with 4 Rechargeable Battery Never run out of battery power when you are about to score the winning point. Save money and protect the environment by using the rechargeable battery High capacity battery that lasts 2~4 times longer than the standard AA batteries Dock both of your remote and plug it into any USB port. No need to remove the battery! LED light glow from the base of the dock station to show the batteries charging status Red indicates the battery is charging; Green indicates the battery is fully charged Capacity: 2800mAh Package includes: 4 Ni-Cd rechargeable battery USB cable 4 Port Remote Control Charging Dock Power source: recommend charging through USB ports from the Wii / Wii U console Accessory ONLY. Nintendo Wii Remote control not included.