The LS1070, Lumicon 5 Milliwatt Green Laser Pointer, is perfect for astronomy. Its bright output @ 532nm, 1.1mm diameter beam and 25,000 feet range make it perfect for finding objects in the sky and pointing them out to others. The Lumicon Laser features heavy-duty construction, on-off switch and constant-wave output. Combined with the Lumicon Laser Pointer Bracket, the Lumicon Green Laser Pointer makes an ergonomic finder system that is easy to use and installs on any telescope. Includes two (2) "AAA" batteries.