ANSWERS: 3
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Infrared, the senser bar picks up the infrared signals from the Wii Remote, this tells it how where your pointing it. However, I'm not sure if it uses bluetooth to send other data, such as transfering Mii's onto the remotes data blocks.
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It uses Bluetooth to connect to the Wii, which would pick up the accelorometers, buttons presses and for the Wiimote data blocks, and infrared for point-and-click uses.
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Bluetooth
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