SecurityIng High Power 400 Lumens Mini LED Gun-Mounted Tactical Flashlight + 3.0V 800mA CR2 Battery Super mini and lightweight design. Anodized aircraft grade aluminum weather-proof compact body design. This product is suitable for all the guns installed with Picatinny rail. Easy install and disassemble, without any tool. Apply to hunting, camping, searching, hiking, fishing, police and so on. Light of this magnitude is enough to dominate an aggressor's night adapted vision. The reflector lens focuses the beam for long distance lighting while also producing enough light to support the user's peripheral vision. Power Source: 1 x CR2 Battery (Included), long service life.