4321 count down timer consists of two components the control unit and the display. The control unit may be installed where most convenient, usually next to the equipment to be started, while the display, with its two 4 inch high digits, may be mounted for optimal visibility to the public. In operation, the control unit is preset with the desired intermission time. When placed in run mode, the remote display will display the preset time and proceed to count down in one minute increments, to zero. When zero is reached, a relay in the control unit closes for one second. This contact is used to activate show control or presentation equipment, such as DVD or audio units. For venues with multiple entrances, multiple displays may be employed. the display units are merely connected in parallel. The RS-485 data transmission technique used allows the displays to be hundreds of feet apart if required. Several modes of operation are available, set by DIP switches on the rear panel.