... are compact and good-looking portable hand held night vision devices.By utilizing their high magnification,excellent optical systems ... for guards,helpinginvestigation and obtaining evidence etc. Binger Night vision technical specifications:Lens magnification ,x 3 Objective lens diameter, ... ,g 530 Effective DistanceDetection range,m 200/150 IR power,mw 25≤IR wavelength,nm 850IR effective distance,m ...