Aside from being innovative and “cool”, these systems were actually pioneered by Mercedes and are designed to deter theft. A metal key cannot be copied (as there is none) and push-button starters require a chip with its own ID code (typically via blue tooth technology) that is much harder to replicate.
Furthermore, there is a random code generate after each engine shut off that is received to the starter unit (the part one plugs in before pressing “start” to turn the car on). “The vehicle will read and match both codes. If the car cannot match the ID code to the last random code sent to the key in question, it won’t start.”
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