 It provides that plug-in. It is the digital signature that tells the onboard computer, hey, I'm here, I'm a lithium key, and I'm ready to start the Camry, and I'm here to do what I'm supposed to do and get the car to run. Once it sees that digital signal, it will then allow the circuitry to engage the starter, activate fuel injectors, and do some different things on different car lines to allow the vehicle to run and operate.