A: A car key remote (fob) works by sending a short, secure radio message to your car when you press a button. Inside the fob, a tiny computer wakes up, builds a data packet with the command (lock/unlock/boot, etc.), an ID that matches your car, and a rolling code that changes every press (often encrypted). A small transmitter then broadcasts this packet over the car’s expected frequency. The car’s receiver is always listening; it grabs the packet, checks the ID and rolling code against what it expects, and—if valid—activates the locks, boot release, lights/horn confirm, or remote start (if supported).
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