As safechav says no control box at all, it's a FOUR circuit immobliser but wires and particularly the COPPER tracks inside the "KEY" are so thin it will not carry much current at all, so most had the circuit doubled up to act as a two circuit immobiliser, a two year old can get round this one, not even worth taking out the box IMO.
The immoby bit is the connection details on the card that you just pull out of it's holder to replicate.
tabetha