It’s part of the cars anti-theft system. The word transponder comes from the words “Transmitter + Responder”. This small microchip embedded in the plastic head of your automotive/motorcycle key receives a signal from your vehicle (from an antenna ring around the ignition cylinder). The vehicle’s computer must receive the proper response form the transponder key or the computer will not allow the vehicle to operate.
Admiral Lock & Key Company
37-17 Broadway, Astoria, NY 11103