For my '95 E320 Wagon I also have a keyless remote. It came with the car. It's made by Avitar Technologies, Inc. You can get an owner's manual P/N 32-5003 and an installation manual P/N 31-5003 if your remote is the 5003 model. The system will disable the starter. Problem with all these devices is that, if someone really wants the car, they cut a hole into the hood and disconnect the battery. Then they load the car on a truck and ship it. What works for me, is that I back it up with insurance by Smith & Wesson.