GOHIKING Tactical Green Sight, 532nm Green Dot Rifle Scope Sight with 2 Mounts,2 Pressure Switches Bright to be seen: Provide clear and strong pointing dot no matter in sunny daylight or in the dark with low light.Adjustable pointing for up/down and right/left by hand. Laser Type: Green; Wave Length: 532nm; Output Power:&lt; 5mw; the gun sight laser is durable and practical. Sight Range: Up to 30-100 Meter by Daylight and to 1000 Meter at Night. Advanced Optics SightIntegrated with optics and electronics, the green gun sight laser provides a wild field of view and suitable for fast aiming and shooting at stationary and moving objects. Easy and convenient to mount. Coming with the 22mm rail and a weaver barrel mount, you can easily install this sight laser. Just need to simply locks on to the top of the telescopic rifle scope 1 inch tube. NOTE: PLEASE PUT THE NEGATIVE SIDE OF THE BATTERY FIRST. Exquisite Gift :Package include Green Laser sight 1, Metal 22mm Picatinny Rail Mount & Rifle 1" Barrel Clamp Mount,Switch button Pressure Pad Switch and "8"type mount, Allen Wrench , 3V CR123A Lithium Battery