The ATN Night Shadow 2 night vision scope comes standard with a cutting edge "Smart" Technology. This technology consists of a computerized proximity sensor, digital controls and a long-range Infrared Illuminator. The proximity sensor will automatically turn the unit on and off when it is brought to the viewing position. This helps to save your battery life and the life of the unit itself. The digital controls allow you to activate all of the features of the Night Shadow 2 with an easy push of a button. They also built a powerful Infrared Illuminator into the scope. This allows you to see even in total darkness with outstanding clarity. It is dark. You can barely see your hand in front of your face. You bring your Night Shadow 2 up to your eyes and turn it on. Suddenly, in green-hued clarity, the entire scene is like a day. For camping, boating, nature study or law enforcement there is simply no better binocular night vision device on the market.