Short range strike scope mounted night vision system. The NiteSite Viper is a patented night vision system for hunting in zero light. It converts your day scope (theres no need to remove it) into a powerful night vision system that is quick and simple to set up. It utilizes 940nm infrared in a unique way making it more affordable, reliable and user friendly than traditional light amplification technologies. The Viper is for the short range hunter. Quick and easy to fit to any day scope. The true beauty of a NiteSite is that it converts any day scope (theres no need to remove it) into a powerful night vision system that is quick and simple to set up. Indeed, from opening the carry case to hunt ready status takes just 60 seconds once you are familiar with the set up. All NiteSites are equipped with adaptable fittings that enable mounting onto virtually any make and size of scope and there is no need to re zero or adjust your scope in any way. Just mount the unit, switch on and youre ready to shoot. Simple as that.