Package includes:1*Blue Violet Laser Pointer1*Two Slot Charger2*Rechargeable 18650 Battery Quick Overview:1.Made of aviation grade metal.2.Safe lock design at the bottom.4.Unload the extended par to use 16340 battery.5.By rotating the focus ring to adjust beam light. Find the smallest spot of the beam light can light a matchstick.Specifications:1.Material: Aviation grade metal2.Dimensions: 5 x 1 inches3.Weight: 4oz4.Power supply: 1 x 16340 battery / 1x 18650 battery5.Laser range: 1.2-5 miles/2km-8k6.Output wave: Continuous wave7.Working voltage: DC=3.0-3.7V8.Start-up time: < 3 secondRechargeable 18650 Li-ion 3.7V 4200mAh BatteryTwo Slot Charger:Input Voltage:AC100V-240V， 50/60HzOutput Voltage:4.2V Output Current:650mASuitable for 18650 batteriesCharger Size: 84mm x 47mm x 38mm.How to Use:1.To lock off the laser pointer， key hole should align with the dot.2.Unable to light a matchstick because the beam is parallel light.3.Adjust the focus to enlarge the spot size.4.Find the Focus Point(the smallest spot size on the beam )， most powerful and capable of lighting a match.5.Keep out of the reach of children.6.Do not point directly at human or animals\u2019 eyes.