Transponder keys are a type of car key that has a microchip inside that can communicate with the car’s immobilizer system. The microchip sends a low-level signal to the receiver near the ignition, and if the signal matches the code programmed in the car, the car will start. Transponder keys are more secure than non-transponder keys because they prevent car theft by hot-wiring or using the wrong key.
Transponder keys can be copied by a locksmith or a dealership, but they need to be programmed to match the car’s code. Transponder keys are more expensive than non-transponder keys because they require more technology and work to make and program.