The vast majority of vehicles built from around 1998 and up, have come equipped with transponder technology. A small computer chip embedded in the plastic head of the key communicates with an antenna around the ignition lock. If the computer recognizes the signal from the key, the car is allowed to start. If the signal is not present or not recognized, then starting is prevented. This was a giant leap in preventing auto theft because it's built into the cars control unit and is nearly impossible to bypass like the older systems. Each of the chips in these keys have their own unique signal, in order to enable the vehicle to drive, the car must be programmed or "taught" to recognize that specific transponder chip. The computer style transponder keys with the added programming fee can be a small fortune at a dealership. Here at KeySmart, we recommend you save your hard earned money and make the "SMART" choice. With prices up to 70% less than anywhere else on transponder keys with programming, the choice is simple. Easy and Smart?...Must be KeySmart.