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Types of Keys For Trucks Around the mid to late 90's, companies started putting a transponder chip in the plastic head of their keys. The chip emits a signal which is read by the receiver in your ignition; if the code isn't in sync, the car won't start. These are commonly known as "chip keys." Beishir can produce these for you at a fraction of the cost of a dealer. Transponder Keys A transponder, also known as immobilizer or chip key, is a tiny electronic chip that is embedded within the head of an automobile key. It contains an unique code.