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Different types of 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. 100 to 300 ft. during the day and up to 1000 ft. at night. Up to 50 times more powerful than most other laser pointers. Just Remove Disco Light Effect Cap From Pen To Get Straight Pointer Light For Presentation. Powered by 3 x AAA batteries ,If batteries are not working properly then use another one for better laser light pointer. Important Note : Please avoid direct eye exposure to the laser. Please store the laser in dry environment and keep it away from children. If batteries are not working properly then use another one for better laser light pointer.