It's a battery pack, and it works, so little reviewing needed there.
But just something I found, if you're setting up the wii fit for the first time you can't use this product whilst syncing it to the wii, because you need to remove the lid to get to the button and the battery pack is connected to that lid! Thus there's no power when you try and sync it...so you'll need 4 batteries to start off with, then the pack works fine...
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