Wii Motion Plus is a great new addition to your Nintendo Wii remote. This cool add-on snaps into the base of your Wii remote controller to offer more precise and responsive control in 3D space. That means that your golf swings, your tennis serves, and your swordsmanship will be more accurate than ever!The Wii Motion Plus add-on uses an accelerometer in conjunction with your Wii sensor bar to precisely track your arm position and orientation, providing you with an unmatched level of immersion. The Wii Motion Plus can render movements identically on-screen with a 1:1 match with movements in the real world.*Wii MotionPlus must be used with a Wii Remote - Included