Specification: 1) Body material: Aerometal 2) Switch: Press button for ON 3) Focus mode: adjustable. 4) Expected lifetime: > 8000 hours 5) Powered by: 1x 18650， or 1x 16340， or 1x CR123A 3.7v Battery -regular or rechargeable-(not included). (Note: Cannot use two 16340 or two CR123A Batteries together， the laser pointer cannot work with two batteries and will broken to work on 7.4v). It is easy to order battery on eBay， just search "18650 battery"， you may find out a lot of them. Please note battery direction: the positive should be on the bottom of this laser pointer. 6) Laser range: 2000-10000 meters 7) Max brightness: > 350lm 8) Net weight: 106g 9) Dimension: 23mm x 162mm10) Body color: black11) Surface treatment: Hard anodizing black12) Wave length: 532nm13) Max output power: 1mW14) Spot size: 6M place <φ10mm.15) Working voltage: DC3.0-3.7v16) Preheat time: < 3 seconds17) Working temperature: +15 degree ~ +35 degree. (In winter， if temperature is low outside of room， please warm up the laser pen inside room for 5 mins).18) Storage temperature: -10 degree ~ +40 degreePackage Include:1 Green laser pointer (Battery & Charger not included)2 Safety keysCautions:1. Keep out of reach from children.2. Avoid direct eye exposure to laser beam.3. Don't keep the laser on continuously for more than 30 seconds， or it will get burnt from inside easily. Full Services:If any problem with this product， please contact seller first. We will make every effort to solve it for you. Thanks!