Autowatch 24 Volt Touchkey Immobiliser. The 433Ti TI is an effective two circuit immobiliser which arms automatically 30 seconds after the ignition is turned off. Deactivation is achieved by inserting the elegant touchkey into the back-lit receptacle momentarily. Because of the backlighting, the unit is easy to deactivate even in darkness and the uniqueness of the light acts as a strong visual deterrent to the car thief. The control unit is housed in a tough, polycarbonate housing in a secure location behind panels requiring tools to remove, thereby deterring the opportunistic thief, and even should he find it, all the control wires are plain black in colour making the tracing of their functions all but impossible.