The HE512C-GD is an enclosed reflex optical sight designed for rifle and carbine applications. Features include Holosun's Gold Super LED with up to 50k hours battery life, Multi-Reticle System, Solar Failsafe, and Shake Awake.Specifications:OPTICAL SPECSReticle 2 MOA Dot & 65 MOA CircleLight Wavelength 590nmReticle Color GoldParallax Free YesUnlimited Eye Relief YesMagnification 1xMulti-Coatings YesELECTRONIC SPECSPower Source BatteryBattery Type CR2032Battery Life (Hours) 50000Brightness Setting 10 DL&2 NVPHYSICAL SPECSWindow Size 0.91x1.26Dimension (in) 3.35x1.63x1.7Weight (oz) 8.1MECHANICAL SPECSHousing Material Durable AluminumSurface Finish MAOAdjustment per Click 0.5 MOAW&E Travel Range A 50 MOAENVIRONMENT SPECSStorage Temperature -40~70Working Temperature -30~60Submersion IP67Vibration 1000G