The HE507C-GR is an open reflex optical sight designed for pistol applications. Features include Holosun's Green Super LED, 50k hours battery life, Multi-Reticle System, Solar Failsafe, Parallax-free, Unlimited Eye Relief and Shake Awake. Includes T10 L key, CR1632 battery, lens cloth and user manual. Brand Holosun Category Red Dot Scopes Model HE Series 507C-X2 Finish Black Anodized Magnification 1x Material Aluminum Proofs Shock Proof / Water Resistant Firearm Type Pistol Reticle Green Dot & Circle Windage Adjustment 50 MOA Battery CR1632 Length 1.78" Adjustment Size 1 MOA Brightness Settings 10 Day / 2 Night Bulb Type LED Dot Size 2 MOA / 32 MOA Elevation Adjustment 50 MOA Eye Relief Unlimited Optic Coating Multi-Coated Parallax Adjustment Parallax Free Weight 1.50 oz Windage Elevation Adjustable