The HS506 is a 30mm optical sight designed for rifle and carbine applications. Features include Shake Awake, 12 brightness settings, Holosun's Super LED with up to 50k hour battery life, Multi-Reticle System, Cantilever Mount, and Flip-up Lens Caps.Specifications:OPTICAL SPECS Reticle 2 MOA Dot & 65 MOA Circle Light Wavelength 650nm Reticle Color Red Parallax Free Yes Unlimited Eye Relief Yes Magnification 1x Multi-Coatings YesELECTRONIC SPECS Power Source Battery Battery Type CR2032 Battery Life (Hours) 50000 Brightness Setting 10 DL&2 NVPHYSICAL SPECS Window Size 30mm Diameter Dimension (in) 5.2x1.9x2 Weight (oz) 6.17MECHANICAL SPECS Housing Material 6061 T6 Aluminum Surface Finish MAO Adjustment per Click 0.5 MOA W&E Travel Range 50 MOAENVIRONMENT SPECS Storage Temperature -40~70 Working Temperature -30~60 Submersion IP67 Vibration 1000G