a wiimotion is for the older version of the wii remote, is an atachment for the remote that goes on the bottom of it, and you need it for surtein games, the newest remotes already have them in it, the remote would say motion plus arround where it says WII , if you have a wii and you remote dont say motion plus arround where it says WII, then you can atach this piece to it, is cool, fanned , watching and hope to get this due to i just got a old remote..lol