Combining state-of-the-art solar cell technology with proven battery power, our brand new Volta Solar red dots feature a dual power system to keep your red dot powered at anytime, anywhere. And forget messing with reticle brightness - an innovative Eclipse Light Management System auto dims and brightens the red dot reticle based on your environment.Features:Reticle: 2 MOA dotReticle color: RedMagnification (x): 1Objective lens aperture (mm): 28Eye relief (in): UnlimitedBody material: Aluminum 6061-T6 / plasticIP rating: IP67 waterproofAdjustment value: 1/2 MOAWindage adjustment range: 160 MOAElevation adjustment range: 120 MOADimensions (in): 3.23 x 1.37 x 1.98Weight (oz): 7.3Battery type: 2x AAABattery life (high/low): 800 / 400,000