Monocular you can see in the dark and stay hidden Lens magnification ,x 3 5Objective lens diameter,mm 44 50Lens system50mmF/1.2 80mmF/1.7FOV at distance 100m/110yards,m 19/63 16/52Field of view,deg 18 12.5Focus range,m1.5 to infinity 1.0 to infinity Exit pupil diameter,mm 6 Eyepiece Dioper adjustment,dptr +4,-4Eye relief,mm 15Power supply,v CR-123 3V battery (one)Battery life IR on,hour Up to ...