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The Sensor Bar allows the Wii Remote to be used as an accurate pointing device up to 5 meters (approx. 16 ft) away from the bar. The Wii Remote's image sensor is used to locate the Sensor Bar's points of light in the Wii Remote's field of view. The light emitted from each end of the Sensor Bar is focused onto the image sensor which sees the light as two bright dots separated by a distance "mi" on the image sensor. The second distance "m" between the two clusters of light emitters in the Sensor Bar is a fixed distance. From these two distances m and mi, the Wii CPU calculates the distance between the Wii Remote and the Sensor Bar using triangulation. Specification: Dimension: 9.5*0.83*0.35 inches (24*2.1*0.9CM) Cable Length: 85 inches (215cm) Weight: 1.79 oz Compatibility: Wii, Wii U Package Content: 1x Wired Infrared IR Sensor Bar, Motion Controller Tracker Replacement for Nintendo Wii / Wii U Consoles 1x Stand