The Challenger GS 1x20 is a multifunctional night vision device. The Challenger GS 1x20 has a number of applications. It can be used as a night vision monocular, night vision goggles (if set up on a Head Mount; the device can be used either for the right or the left eye), and a night attachment for a day optical riflescope or a collimator sight.The body of the device is hermetically sealed which enables use in inclement weather (fog, heavy shower, dusty environment, sand storm etc.).