This green laser pointer pen has 532nm wave length green laser beam! And aluminum alloy structure green laser pointer pen sturdier and cool for use! The clearly visible beam of light at night makes this green laser pointer pen at night makes this laser pointer pen an ideal way to point out stars to a group of scouts. During the day the green dot is bright even in direct sunlight. And the green laser pointer pen very handy for pointing out distant locations or features on nature hike! This green laser pointer pen is powered by 2 x AAA batteries and can be easily activated by pressing momentary on/off switch at the middle of the laser pointer pen! Make this green laser pointer pen a great assistant at your lectures and presentations. Perfect nature hiking and venture tool for you to scare away wild animals or locate your position when you are lost or injured in an isolated location!