a USB laser pointer is simply a laser pointer powered by the USB
socket.
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how do you our in batteries on a laser pointer
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No. Each laser pointer uses a laser that emits a specific color.
the only way to get a different color would be to get a different
laser.
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A Green Laser Pointer is very simple to use. In order to see the
green laser from the pointer, you press the button and point it
onto an opaque surface.