A Time Control Unit is a golden sphere about the size of a Cricket ball. It is stored in the Secondary Control Room. All TARDISes have one of these devices, which can be used to remotely control a TARDIS by broadcasting Stattenheim signals that travel along the time contours in the Space/Time Vortex. It allows a minimum of two Time Lords to (with some difficulty) telepathically remote control a TARDIS that the Time Control Unit is linked to. The Time Control Unit can be detached from the console and taken into the field. Some Time Lords have used it to shift one end of a Time Corridor to a different point in time.