... smuggling investigation and night patrol for guards,helping investigation and obtaining evidence etc.In one word,Nightfall are fantastic night vision units,Theyre just for you! ... .6V battery (one) Battery life IR on,hour Up to 20 Battery life IR off,hour Up to 60 Overall ... DistanceDetection range,m200/150 220/175IR power,mw 25≤IR wavelength,nm 850IR effective distance,m 25 Environmental DataIP ...