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 Convenient Tray Battery Compartment Parallax-free & Unlimited Eye Relief The HE503CU-GR is a 20mm micro optical sight designed for rifle and carbine applications. Features include Solar Failsafe, Shake Awake, 12 brightness settings, Holosun's Green Super LED with up to 50k hours battery life, and Multi-Reticle System.