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Types of Keys For Trucks Around the mid to late 90's, companies began placing a transponder chip in the plastic head of their keys. This chip emits a signal that is read by the receiver in your ignition; if the code isn't in sync, the car won't start. They are also known as "chip keys." Beishir can make these for you at less than the cost of dealers. Transponder Keys A transponder, also referred to as immobilizer or chip key, is a tiny electronic microchip which is embedded into the head of a car key. It