50mw laser pointer is made of high quality material, so it is enough durable for long time using. The cheap 50mw green laser can be seem as far as the eye can see, power saving, compact and reliable. Lightweight and handy design, it is very convenient to put in bags or pockets. Perfect for teachers, professors, doctors, managers, engineers and so on. Come with black clamp, you can use it to connect the Laser pen to bicycle handlebar easily. http://www.everyonetobuy.com/mini-flashlight-green-laser-pointer-50mw.html