When doing remote start on late model cars, you can use this module to bypass the transponder in the key. When remote start is engaged, this device will send the transponder signal to the vehicle reciever.Key Specifications/Special Features:Designed for vehicles equipped with RFID OEM transponder based immobilizer Transfers via RF coil, which resides on the key cylinder Automatically transmits the signal during remote start Requires the use of a vehicles spare key Click here for instructions