Portable size and science shape design. Simple and easy to use. Across the sky, allowing you to find the stars in the fine days, is the leader in the vast sky. This high quality laser pointer adopts the latest technology optics and microelectronics. Press-button switch at the bottom, no need to keep holding when use it. The copper at the end is fixed by aluminum sheet, which avoids short-circuit. High quality crystalloid inside ensures the laser working efficiently. Warnings: Never Point to the people or animal for it is really strong power! Avoid direct eye exposure to laser beam, exposure to the eye can cause permanent damage. Keep away from the children. Please don’t keep it on for a long time, the laser is high power and get hot easily. So it is recommended to limit it to 30 seconds or less per use to avoid heat buildup. Once you feel the laser get hot you’d better let it have a rest. When not in use, it is a good idea to remove the battery and keep it safely. If you find that the brightness of laser beam is getting seriously weaker, please recharge the batteries. Specification: Wavelength: 445nm-450nm Power: 1000mw Beam style: continuous line. Spot size: 6M place <φ10mm. Power supply: 2 x 16340 Battery Laser range: 8000 meters (5 Mile). Focus mode: adjustable. Body material: Metal Working voltage: DC=7.2-8.4V. Preheat time: < 3 seconds. Working temperature: +15℃～＋35℃. Storage temperature: -10℃～+40℃. About 16340 Double Charger: Capable of charging 2 batteries simultaneously Each of the two batteries charges independently Compatible with small capacity batteries Automatically stops charging when complete Features over-charge prevention to protect batteries Battery Type: 18650 Battery Plug: US EU plug Color: Black Material: Plastic Input: AC 100-240V 50/60Hz Max 150mA Output: DC 4.2V 650mA