Most cars built in the last five years have coded engine immobiliser system. The keys have a unique electronic code that matches a code held in the engine management system and is checked every time the car is started. If the code is not right the car will not start. So if the keys are lost the owner will have a major problem. Now you can use this device to read the cars’ electronic code and to program transponder keys for those unfortunate car owners, this will be a profitable business as the Dealer will normally charge over US$50 or 40 Euros for copying each transponder key!