2 Key Features One pressure-on button switch、 safety key lock design; easy and safe to operateAnti-slip grid body shape; high intensity aluminum alloy body material and copper module50mw actual power output、 capable of lighting matches; yet with safety lock by keys on tailPowered by one 18650 or 16340 rechargeable battery (not included)Adjustable focus by rotating zoom ring; one starry head cap include  3 Specifications-tw cen mtExterior material: strong aviation aluminum alloyModule material: pure copperBattery: 1x 18650 or 16340 lithium batteryLight beam color: GreenBeam Visibility: 1500mStarting time: <3sReal power: 50mWProduct size: 158*22*22mmNet weight: 55gPackage weight: 66g 4 Packing List1x YL-Laser 303 laser pointer pen2x Keys to safety lock on tail1x Starry head cap1x Length-adjust tube Note:1. Install the battery with Cathode Inside!2. Please uninstall the length adjust tube when using 16340 battery.3. Uninstall the battery or turn the safety lock to the red dot if it is not to be used for a long time.4. Laser beam can cause direct damage to living beings. Do not point at people or animals' eyes.5. Continuous lighting longer than 30s may cause overheating and reduce module longevity.