The Holosun HE508T-RD X2 is a titanium, open reflex optical sight designed for pistol applications. The X2 Series pistol optics feature two improvements. First is the addition of Lock Mode. Lock Mode, when activated, locks the buttons preventing inadvertent setting changes. Second, the buttons have been redesigned to compliment the Lock Mode by placing them lower and out of the way. Additional features include a Titanium housing, Holosun's Super LED with up to 50k hours battery life, Solar Failsafe, Multi-Reticle System, and Shake Awake. Multi-Reticle System: Circle dot, 2 MOA Dot, 32 MOA Circle Up to 50,000 hour battery life 12 brightness settings (2 NV Compatib Mfg: Holosun