Wii MotionPlus

The Wii MotionPlus (Wiiモーションプラス) is an expansion device for the Wii Remote, the primary game controller for the Wii. The device allows more complex motion to be interpreted than the Wii Remote can do alone. Both the Wii and its successor, the Wii U, support the Wii MotionPlus accessory in select games.