Wii MotionPlus

The Wii MotionPlus (Wiiモーションプラス) is an expansion device for the Wii Remote video game controller for the Wii that allows it to more accurately capture complex motion. According to Nintendo, the sensor in the device supplements the accelerometer and Sensor Bar capabilities of the Wii Remote to enable actions to be rendered identically on the screen in real time.

Later versions of the Wii Remote have the MotionPlus technology built in, but can also be more difficult to connect to. Refer the Wii Remote Plus (RVL-CNT-01-TR) Connection Guide for further details.