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laser pointer can show different colors of light, and the apparent brightness of a spot from a laser beam depends not only on the optical power of the laser and the reflectivity of the surface, but also on the chromatic response of the human eye. The laser pointer can be used to highlight something of interest by projecting a small bright spot of colored light onto it. It can be used in different areas which include educational and business presentations, architecture, astronomy, camp and adventure, and entertainment etc. Easily to use, only need to push the button then you can see striking green beam of light shoot forth. Best choice for teachers, professors, doctors, and so on. In addition, it is lightweight and handy, easy to carry and suitable for put in your pocket or handbags. Special Features:- Visible Beam You can focus the beam to the smallest. You can see beautiful and strong green laser beam at day time. It has safety lock function with keys, you can turn the key to the red point to lock it .