AE21-MT1 clock/timer system is ideal for timing speakers, meetings, or procedures. Used for setting time, sending numbers, or running elapsed timer functions. CC2002 display automatically switches from hours and minutes to minutes and seconds when count down time is less than 1 hour. The system consists of an AE21 terminal connected to a CC2002 display and a 120VAC to 24VAC power module. A 100ft data cable is included so that the AE21 can be located up to 100ft away.