LED (Light Emitting Diode) 100% safe for the eyes. Unlimited Eye Relief for flexible mounting. Red and Green colored Four Reticle set: Dot, Star Burst, Cross, Bullseye Multi-position rheostat knob for five brightness settings for each Red & Green color reticle. Integrated Auto-Locking Quick Release Mount that will mount onto virtually any firearm with a Weaver, Picatinny, MIL-STD 1913 type rails. Black Anodized Aluminum Construction.