The Wii Balance Board is shaped like a household body scale, with a plain white top and light gray bottom. It runs on four AA batteries as a power source, which can power the board for about 60 hours. The board uses Bluetooth technology and contains four pressure sensors that are used to measure the user’s center of balance—the location of the intersection between an imaginary line drawn vertically through the center of pressure and the surface of the Balance Board—and weight. In an interview conducted by gaming web site IGN, Shigeru Miyamoto stated that the Balance Board’s ability to measure weight is probably more accurate than that of a typical bathroom scale.

Although the Japanese packaging states that it is designed to support people weighing up to 136 kilograms (300 pounds) and the “Western” Balance Board up to 150 kg (330 pounds), they are actually the same board. The packaging differs due to regulatory differences between Japan and the United States. The sensors on the board can accurately measure up to 150 kg (330 pounds). The actual physical structure of the board can withstand much greater force equivalent to around 300 kg (660 pounds).

Due to the similarities between the two products, the Wii Balance Board has been compared to the Joyboard, a peripheral released for the Atari VCS in 1982 by Amiga Corporation. The technology in the Joyboard was less advanced than that in the Wii Balance Board, with four directional switches instead of pressure sensors.

The manual says that the Balance Board should only be used on a hard surface or thin carpet, as thicker or softer surfaces may cause the board to operate incorrectly. A set of foot extensions is available to allow the board to be used on softer surfaces. The extension feet are included with some versions of the Balance Board, but not in European versions.

The balance board should be used bare-footed; socks do not properly grip the hard surface, and can create a danger. Novelty Wii Fit non-skid socks, which have small rubber pads on the sole that do not slide easily, were provided to members of Club Nintendo.

Source: Wikipedia (https://en.wikipedia.org/wiki/Wii_Balance_Board)
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