The light show you can project with this pen sized laser (1/2" diameter X 7"L) has to be seen to truly be appreciated. You can project a light show the size of a house or whole room. Unscrew the tip and you have a green laser pointer to point out stars and constellations! This is a true 30mw green laser diode ,superior quality 5,000 hours and it has an 8 mile range! Comes with batteries and lined box. We guarantee your amazement and satisfaction.