... 44 50Lens system 50mmF/1.2 80mmF/1.7FOV at distance 100m/110yards, m 19/63 16/52Field of view,deg ... battery (one by 1.5V)Battery life IR on, hour Up to 20Battery life IR off, hour Up to 60 Overall dimensions ... ,g 530 613 Effective Distance Detection range,m 200/150 220/175IR power,mw 25≤IR wavelength,nm 850IR effective distance,m 25 Environmental ...