http://tinyurl.com/mvhwpc9 green laser usage:Field travelers, explorers? for outdoor lighting, indicating distant targets and send a distress signal. New features are: extremely cold extreme heat does not affect product performance; waterproof, moisture, sweat, water, wear-resistant features, particularly suitable for field use. Make your trip more fun interesting is the preferred equipment for outdoor activities.? amateur astronomers observing the starsMeans for astronomy satellite, laser light emitted will draw a beautiful ''green'' in the night sky, it is suitable for observing the night sky, can accurately indicate the position of the stars. Direct target airspace, very spectacular.? mining sites, construction sites and related personnel
A laser pointer is a small laser designed to highlight something of interest by projecting a small bright spot of colored light onto it. The laser beam is not in itself visible from the side, but is visible as a result of light scattered by dust particles along the beam path. The small width of the beam and low power of typical laser pointers make the beam itself invisible in a reasonably clean atmosphere, showing a point of light when striking an opaque surface. Some higher powered laser pointers are faintly visible via Rayleigh scattering when viewed from the side in moderately to dimly lit conditions.