The HS507C-X2-BB is an open reflex optical sight designed for full sized pistol applications. The X2 Series pistol optics feature two improvements. First is the addition of Lock Mode from our 2018-2019 LE pistol optic models. 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 Holosun s Super LED with up to 50k hours battery life, Multi-Reticle System, and Shake Awake. Shake Awake Holosun's Shake Awake Technology shuts the LED off during periods of motionlessness and the on-board motion sensor instantly reactivates the it at the slightest movement. The delay before entering Sleep Mode is programmable or can even be deactivated entirely to keeps the optic powered on for up to 50k hours. Multiple Reticle System M.R.S. gives this optic the ultimate in flexibility. Turn on or off certain sections of the reticle until you have the ideal reticle for the job at hand. Multilayer Reflective Glass Holosun red dot sights and magnifiers are manufactured using optical glass with multilayer coatings that reduce glare and facilitate maximum light transmission and wear resistance. Product Specifications Reticle: 2 MOA Dot & 32 MOA Circle Light Wavelength: 540nm Reticle Color: Red Parallax Free: Yes Unlimited Eye Relief: Yes Magnification: 1x Multi-Coatings: Yes Power Source: Battery Battery Type: CR1632 Battery Life: 50,000 hrs Brightness Setting: 10 daylight and 2 night vision Window Size: 0.63x0.91 Dimension: 1.78x1.15x1.1 5" Weight: 1.5oz Housing Material: 7075 T6 Aluminum Surface Finish: Anodized Adjustment per Click: 1 MOA Storage Temperature: -40 C ~ 70 C Working Temperature: -30 C ~ 60 C Submersion: IP67 Vibration: 5000G Included in the Box Multi Tool User Manual Lens Cloth