I got a F150 FX4 last month and the person that it came from had a security system on it that seemed kind of weird to me. The truck is lifted and has big tires on it so i think its a way if someone were to get the keys and get into it and try to start it they won't be able to figure out how to start it. So the way you have to start the truck is turn the key to the ignition setting, wait for a different kind of beep and then you can start it. Has anyone ever heard of this type of security system and if you have do you know what it is called and model?

Thanks for any of the help.