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There are three, sometimes 4, if you include the buttons in the sensors.

the other one is a small CMOS camera, it takes pictures of dusts specs, and little abnormalities in the surface, and compares all the pictures.

By comparing them it can track how much it has moved, and provide feedback to the computer, most of these cameras have about 128 pixels.

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Q: How many sensors in mouse laser and what are they?
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