Operation Instructions:For optimum performance and to prevent damage to this percisionInstrument, carefully all instructions.Features:Diamond coat, scratch resistant mangin lens for maximum field-of-view, brightness, and resolutionExtremely durable aluminum housing8 illumination settings for red and green dotUnlimited eye relief1/2MOA click elevation/windage adjustmentWide field-of-viewBlackened lens edgesSpecifications:Magnification:1XSight window:1.26mmx.98mmElevation adjustment range:60 MOA20 MOA per revolution of adjustmentSubtension of the aiming point:1.0 MOA DotOperting Temperature Range:-20°F to +120°F(-29°C to+49°C)Storage Temperature Range:-40°F to++160°F(-40°C to +71°C)Power Supply: One(1)3V CR123A battery(not included)Dimensions:(LxWxH)91.4mmX57.1mmX61.2mmBattery changed selftest:red-green in turn ofr eight times.