> Are you right they are laser? I've seen some people that put blue led's
> replacing the red ones, and they work. Not to mention the nice
> appearance...

All the ones I've seen use a laser. This allows them to work an a very
smooth surface. If the surface is rough you get shades from the slanted
light, and thus contrast. If it is smooth you get speckles, and thus
contrast. Maybe someone makes mice with IR lasers and the LED is just for
coolness...

Peter

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