The HS507K is an open reflex optical sight designed for concealed carry pistol applications. Features include Holosun's Super LED with up to 50k hours battery life, Multi-Reticle System, Shake Awake, and Lock Mode.Features:Reticle: 2 MOA Dot & 32 MOA CircleLight Wavelength: 540nmReticle Color: RedParallax Free: YesUnlimited Eye Relief: YesMagnification: 1xMulti-Coatings: YesPower Source: BatteryBattery Type: CR1632Battery Life (Hours): 50000Brightness Setting: 10 DL&2 NVHousing Material: 7075 T6 AluminumSurface Finish: AnodizeAdjustment per Click: 1 MOAW&E Travel Range: A 50 MOAWindow Size: 0.58x0.77Dimension (in): 1.6x0.98x0.95Weight (oz): 1Storage Temperature: -40?~70?Working Temperature: -30?~60?Submersion: IP67Vibration: 5000G