The ES 562U (12 Hour) and ES 564F (24 Hour) are 6-digit "Clock/Timers" with .55" high yellow LED displays. Once time of day has been set, the unit can be switched into the "Timer" mode and be used as a 12/24 hour timer. Subsequently, the unit can be "toggled" from the "Clock" mode to the "Timer" mode with no loss of real time or elapsed time. Built-in "UP" timer.