The HE509T is an enclosed reflex optical sight designed pistol applications. Features include Titanium housing, Holosun's Super LED with up to 50k hours battery life; 12 brightness setting- 10 daylight & 2 night vision; 2 MOA Dot/32 MOA circle; parallax free and unlimited eye relief; solar failsafe and shake awake. Includes RMR adapter, lens cloth, CR1632 battery, T10 L Key and user manual.