The HE509T-RD X2 is an enclosed reflex optical sight designed for pistol applications. Features include a Titanium housing, Holosuns Super LED with up to 50k hours battery life, Multi-Reticle System, Solar Failsafe and Shake Awake RMR. Includes User manual, lens cloth, T10 L key, CR1632 battery. The included 509T RMR adapter plate is not compatible with ZEV or Shadow Systems style RMR interfaces.