Notice Please read this first 1 This item runs on 3pcs AG3 Batteries which are Not Included You need to buy them at your Local Shop Hope you consider it before order 2 The laser light image shown here is for reference only In actual use the laser light beam is INVISIBLE and it only results in a red dot on the irradiated object Please take the actual situation on real product as standard Thanks for your understanding Caution Avoid direct eye exposure to the laser beam Laser radiation is emitted from the aperture Specification Material Aluminum AlloyBody Color BlackLaser Type Red LaserLaser Wavelength 650nmClear Range 20 100mPower Supply 3Pcs AG3 BatteriesPower Output 5mWRail Mount for 20mm RailBattery Installation Positive side facing outwards Look at your button cell battery you will see on the flat side commonly which means positive And the other slightly rounded side is the negative side Features 1 Aluminum Alloy Quality Made of aircraft grade aluminum construction durable and sturdy 2 20mm Picatinny Rail Mount Universal clamp on mounting dech to fit most tactical equipments 3 Accurate Sight Long distance red dot laser sight clear and extra bright laser beam Clear range 20 100m can be reach 300 meters at night 4 Easy to Get Zeroed Precise and wide range windage and elevation adjustments for most firearms Use the wrenches adjust it up or down left or right 5 Easy to Use The ON OFF button is on the back of laser easy to press on it