In order to operate the Beseler Dichro 45 Color Computer lamphouse, the AC cord is plugged directly into an AC outlet, and a separate cord with special 6-pin connector is used to connect the lamphouse to a timer. Since the Timer Cord can be completely disconnected from the lamphouse, it's easy to lose. The colorhead cannot function without it since this cord supplies power to the lamp. If the Timer Cord for your Computerized Colorhead is missing or has been damaged, this is the correct replacement.