The HE508T-RD-X2 is an open reflex optical sight designed for 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; parallax free and unlimited eye relief; solar failsafe and shake awake. Includes Picatinny mount, lens cloth, CR1632 battery, T10 L Key and user manual.