If you are thinking of purchasing this product, I would highly recommend you think again. Ours worked fine for a time but then we started getting messages such as "I can't find you" and then "Please step off the board and press A" when we were trying to boot up the system and weren't standing on the board. Having contacted Nintendo, we were told that the power pack was not a Nintendo product and had never been tested for compatability with the Wii Board. We were told that our problem had been caused by the power pack and we were advised to remove it, leave it for 1-2 hours, replace single batteries and try again. If this did not work, it was beyond repair. It did not work and the board needed replacing. On inspecting the power pack packaging, we found the following in small print on the back of the power pack box, "This product is neither endorsed, nor sponsored, nor affiliated with Nintendo". We have been advised by Nintendo not to use the power pack as it could cause our new board to malfunction.