The HE512T-RD is an enclosed reflex optical sight designed for rifle and carbine applications. Features include a Titanium housing, Holosun's Super LED with up to 50k hours battery life, Multi-Reticle System, Solar Failsafe, and Shake Awake. The convenient tray battery compartment allows you to easily change the battery with out taking the optic off your weapon.Features:Absolute co-witness mountMRS: Circle Dot; 2 MOA; 60 MOA CircleUp to 50,000 hours battery life (setting 6)12 brightness settings: 10 DL and 2 NV compatibleConvenient tray battery compartmentCompletely enclosed design & titanium housingParallax-free & unlimited eye relief