This pen style laser pointer machined of aerometal meterial and comes in a compact size. It is perfect for everyday carry. This laser pen is powered by two AAA batteries and delivers a bright beam. There are four beam colors for your choice: green beam(100mW), red beam(300mW), blue beam(200mW), purple beam(200mW). We believe you’ll find this laser to be perfect for teaching, guiding and outdoor activities. https://www.htpow.com/blue-green-red-violet-laser-pointer-pen-class3b-p-1230.html