is the car second hand?
the only way to find out whether you have one or not is to find the paper work, receipt and receipt of fitting. you should have been given a manual on how to use it and if a previous owner did fit anything like that, there will be paperwork for him to sign saying he is now, no longer the owner, and you give them your details and they would (i think) give you an ID number so you can provide the police with it if the car was ever stolen!