PDP Energizer 2X Charging System - Nintendo Wii Charge 2 Nintendo Wii U or Wii wireless controllers simultaneously and twice as fast Charging station comes with an USB cord and 2 Energizer Rechargeable Battery Packs for up to 10 hours of playtime Plug USB cord into Wii U or Wii and ensure that console is on to activate charging power Replace controller batteries with Energizer ones and then simply dock controllers in charging station- green light indicates when they are completely charged Officially licensed by Energizer