The DRGB is a Tactical Red Dot Reflex Optic with a Cantilever mount. The Cantilever mount will mount onto nearly any Weaver/Picatinny type rails. The scope features a Rheostat knob with three brightness levels for each of the Red, Green and Blue Dot reticles, black ocular and objective flip-up lens covers for a nice contrasting look. Includes extra battery and mounting tools. Features: LED (light emitting diode) 100% safe for the eyes Unlimited eye relief for flexible mounting Rheostat knob with 3 brightness levels for each of the red, green, and blue dot reticles Ocular and objective flip-up lens covers Powered by 3 V lithium batteries (CR2032) included International orders will not include batteries Cantilevred 30mm mount at 1-1/2 inches centerline height, Rail clamp on with thumb nut, compatible with Weaver/Picatinny/MIL-STD 1913 type rails mounting