NcStar tactical Red/green/Blue dot sight with cantilever Weaver mount. Features: – Unlimited eye relief – black anodized aluminum construction – three brightness settings for the Red, green, Blue dots – 30mm cantilever Weaver style mount for mounting onto most Weaver style/Picatinny rails – Red, green, and Blue LEDs (light Emitting Diode) 100% safe for the eyes. Specifications:- length: 5.0′ – width: 2.7′ – height: 3.1′ – weight: 8.9 oz. – mount length: 2.68′ – objective lens diameter: 35mm – magnification: 1x – reticle: Red, green, & Blue dot – dot size: 3 MOA – click value: 1 MOA – lens coating: Platinum – battery type: CR2032