Approximately 60 times brighter than a red laser pointer, you can actually see the beam of this 532 nm green laser pointer in mid-air in a dark night sky. It's great for pointing to constellations while stargazing. As a safety signal device, a green laser pointer can be seen at much greater distances than a red laser. Includes metal case. Requires 2 AAA batteries, included. Caution: All laser pointers can damage the eye; avoid direct eye exposure. Not for children. Legality may vary by jurisdiction, consult and uphold local laws for laser use.