Instead of a physical metal key, Ski-doo snowmobiles are built with an exclusive digital electronic key called the Digitally Encoded Security System (DESS) cord. The snowmobile can not be moved without this digital key plugged into the console. The DESS cord also acts as a tether cord that attaches to your jacket, so if the key is unplugged from the vehicle, the ignition is cut and the engine stops. In this instance, if you were to fall off of the snowmobile the engine would stop immediately!