The HE515GM-GR is a 20mm micro optical sight designed for rifle and carbine applications. Features include 7075 Aluminum Housing, Solar Failsafe, Shake Awake, 12 brightness settings, Holosun s Green Super LED with up to 50k hours battery life, Multi-Reticle System, QD mount, Kill flash, and Clear Lens Caps Includes: Quick Release & Detachable Mount T10 L Key User Manual CR2032 Battery Lens Cloth Product Features Green MRS:2 MOA Dot; 2 MOA Dot & 65 MOA Circle Up to 50,000 Hours Battery Life (Setting 6) 12 Brightness Setting: 10 DL & 2 NV Compatible Parallax-free & Unlimited Eye Relief Quick Release & Detachable Mount Shake Awake Multiple Reticle Systems Super LED Multilayer Reflective Glass Product Specifications Reticle: 2 MOA Dot and 65 MOA Circle Reticle Color: Green Magnification: 1x Window Size: 20mm diameter Adjustment per Click: 0.5 MOA