Economical laser pointers are useful for many optical experiments. Lasers operate on a push-button switch, are housed in a rubberized aluminum pen-style case, and include a pocket clip. Laser Pointer features both Red/Green beams. The 6" long x 0.5" diameter Class 3R Red laser pointer has a maximum output of 5mW and a wavelength of 532nm. Operates on two "AAA" batteries. The 6" long x 0.5" diameter Class 3R Green laser pointer has a maximum output of 5mW and a wavelength of 532nm. Operates on two "AAA" batteries.