This handy, laser may be used as a pointer or for experiments. Includes 17 experiments with manual. An education kit is also available containing lenses, mirrors and manual for even more experiments. Specifications: cents Output power: 3mW cents Wavelength: 675nm cents Beam diameter: 10mm at 6m cents VLD (index guided) with photodiode feedback for stability Class IIIA U.S. CDRH cents Dimensions: 145mm long, 12mm diameter cents Weight: 35g cents Power: 2 AAA batteries