Laser pointer 301:1.Material: Aluminum Alloy2.Power Supply: 1 x 18650 battery3.Length: 153mm4.Diameter: 22mm5.Net Weight: 86g6.Quantity: 1pcs7.Laser range: 1.2-5 miles / 2km-8k8.Working voltage: DC = 3.0-3.7V?Features:1.Made of aviation grade metal.2.using the safety lock key can lock off the laser pointer、 which can avoid people hurting.?How to Use:1.Capable of lighting a match.2.Adjust the focus to enlarge the spot size.3.To lock off the laser pointer、 key hole should align with the dot.4.By rotating the focus ring to adjust beam light. Capable of lighting a match.About 18650 Battery:- 1PCS BRC 18650 3.7V Rechargeable Unprotected Li-ion Battery- Over temperature and over current protection- Short-circuit protection & Environment friendly- Widely used on torch、 laser pointer、 as emergency lighting and other portable devices??Package included:1 x 301 Laser pointer1 x 18650 battery1 x DC Charger1 x Car Charger2 x Safety lock key