Human eye is more sensitive to green color and this laser pointer is much more noticeable than other light colors. Green laser pointers are brighter (about 60 times) than red laser pointers. Use your laser pointer to point at any desired targets on projection screens, video monitors, presentation graphics and more. A best suitable kit for astronomers, professors, teachers, doctors, student presentations and etc. Aluminum case, compact design. Switch on/off at the end of the laser pen body. Powered by one 16340 battery (Battery included). 100mW green laser, is ready to work for your purpose. Low consumption.