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Types of Truck Keys Knowing what type of key you have makes it easier to get an alternative. Here are the different types of keys and their features. This key looks like any other key, but it has an electronic chip to prevent car theft. This chip communicates with the vehicle to initiate it. Transponder Keys A regular transponder key looks like a normal metal key, but with the top of a plastic which houses the transponder. This type of key is found on the GM Circle Plus keys and P