I got this and LOVE it. It is a set of replacement rechargeable batteries for the Wiimote. It comes with 2 rechargeable battery packs for 2 Wiimotes and cost $30. The unit also comes with 2 battery replacement covers for the battery compartment and they have a rubber grip on them that is super nice. Here is the complete feature list: Charge 2 Wii remotes simultaneously Includes 2 rechargeable NiMH battery packs LED Charge Indicator lights Dual port rapid recharging dock 6 foot power cable Rubberized battery covers for superior gaming performance The only 2 small draw backs is 1: it's not usb so you have to plug it into a wall socket instead of one of the Wii's usb ports. 2: The Wiimote's strap makes it where u have to position the Wimote on the charge exactly or else the strap will get in the way and prevent the batteries from making contact with the charger. It's not too big of a deal, you just can't drop the Wiimote in carelessly, you have to position them in there. The rubber grip on the battery cover is so good I just took the wrist strap's off the Wiimote's altogether and it sits in there with zero effort. There are also leds on the front that tell you when the unit is charging and when the Wiimote is fully charged. I can't tell you how nice it is to have a rechargeable Wiimote and not have to go through a ton of batteries each month. I can't believe Nintendo did not make this a standard for the Wiimote or at least market their own version to sell. Nyko's website: http://www.nyko.com/nyko/products/?i=102 According to Nyko's site you can get them at Wal-Mart, Target, BestBuy, Amazon.com, GameStop, EB Games, but I couldn't find one locally so I just ordered from Nyko's online store.