Magnification:4XLens Diameter:42mmFocus Range:5 Yard To Inf.Eye Relief:10mmDiopter Adjustment:± 1.5Power Supply:3V (CR 123A battery) Battery not includedOperating Time:8+ HoursOperational:Day or NightDisplay:Vivid Color DisplayOperating Temperature:-22°f To +140°fDimensions:7.2" (L) X 3"(W) X 2.5" (H)Weight:12 oz.