With powerful functions and high quality material, this laser pointer is a good choice for people who loves outdoor activities. 1.Model No: G303(Green Laser Pointer) 2.Body color: black 3.Size: 15cm x 2.5cm/ 5.90" x 0.98" (Approx.) 4.Body material: aerometal 5.Switch: momentary switch 6.Focus mode: adjustable focus 7.Wave length: 532nm 8.Laser output power: < 5mW 9.Expected lifetime: > 8000 hours 10.Workins time: > 1 hour 11.Battery:18650 Li Battery or 16340 Li Battery (NOT INCLUDE BATTERY) 12.Max brightness: > 350lm NOTE 1. Avoid direct eye exposure to laser beam. 2.Please don& 39;t keep open for a long time, otherwise easy to damage the light bulb. 3.If you want to light match,pls adjust the focal length to the largest .and then match at a distanc of approximately 10cm from lamp holder. 4..It can bum only BLACK match,can not bum paper or something else. S.In winter, if temperature is low outside of room, please warm up the laser pen inside room for 5 minutes.   Package Includes: 1 x Laser Pointer 1 x Starry Head  1 x Safety Key 1 x Hand Strap