The HS507C-X2 is an open reflex optical sight designed for pistol applications. The X2 Series pistol optics features Lock Mode, when activated, locks the buttons preventing inadvertent setting changes; buttons have been redesigned to compliment the Lock Mode by placing them lower and out of the way; Holosun's Super LED; 50k hours battery life, Solar Failsafe, Multi-Reticle System and Shake Awake. Includes T10 L key, CR1632 battery, lens cloth and user manual.