1) Extremely bright green laser at 532 nm wavelength 2) Range of approximately 12,000 ft in darkness 3) 1.1 mm beam diameter at source 4) Momentary push button switch 5) Solid, heavy duty construction 6) Constant wave output (as opposed to pulse output) 7) Takes 2 "AAA" batteries (included) 8) Can be used for sky pointing, astronomy, projection on low clouds, signaling