Features1.Made of aviation grade metal.2.Prevents laser light from accidentally hurting people and keeps children from playing with it without supervision with safe lock design at the bottom.3.To lock off the laser pointer， key hole should align with the dot.4.To use 16340 battery， all you need to do is unload the extended part.5.By rotating the focus ring to adjust beam light. Find the smallest spot of the beam light to light a matchstick.SpecificationMaterial: Aviation grade metalDimensions: 5 x 1 inchesWeight: 4ozPower supply: 1 x 18650 battery/1 x 16340 batteryLaser range: 1.2-5 miles/2km-8kmOutput wavelength: 532nmOutput power: ¡Ü5mWOutput wave: Continuous waveWorking voltage: DC=3.0-3.7VStart-up time: < 3 secondsWorking temperature: +15¡æ ¡ª +35¡æ(+59 ~ +95F)Storage temperature: -10¡æ ¡ª +40¡æ(14 ~ 104F)How to use?1.Unable to light a matchstick because the beam is parallel light.2.Adjust the focus to enlarge the spot size.3.Find the Focus Point(the smallest spot size on the beam )， most powerful and capable of lighting a match.NoteKeep out of the reach of children.DO NOT point directly at human or animals¡¯ eyes.Package includes1 x Laser pointer1 x rechargeable 18650 battery1 x charger