Nite Site Viper night vision system. Simply connects to any rifle scope. The system works by having a camera that attaches to the eye end of a scope via a rubber adaptor which feeds a live image to a screen which is fixed to the top of the scope. The scopes own reticle is seen on the screen so there is no need to rezero. The kit includes everything needed to attach the system to a scope and comes with its own heavy duty carry case. The system adds only 698g to a rifle. The Viper has a identification range of 100 metres. With the IR at half power the run time is 7.4 hours. The display screen is 3.5 inches. The system operates at temperatures between -20c and +60c and is water resistant.