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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 2 x AAA batteries ,If batteries are not working properly then use another one for better laser light pointer. For straight pointer just remove the Disco Light Effect Cap from the bottom of pen. Best choice for Teacher, Professor, Doctor etc. Rotate the cap to get various types of beautiful disco light effect. Best gift option . it is lightweight and handy, easy to carry and suitable for put in your pocket or handbags. the beautiful Green laser beam from laser pointer is suitable for night sky observation which can point out the position of the star you are looking at. this laser can measure the accurate position of building in the faraway distance without close to the dangerous area. it can be used to explain the scenery in the distance or all kinds of exhibitions, a good guide and companion for your travel. it will be a good tool for pointing out the faraway target and sending out the SOS signal, will make your travel more fun and secure. It will be the best guide for the climber who lost in the mountainous areas, can send out the SOS signal in time.