ES-180     2-Digit Countdown Timer ( DC 9~15V)

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This counter can be used to switch on an electrical appliance (or other loads) for a preset duration. The ranges are : 1 ~ 99 sec. or 1 ~ 99 min. (Note :  99 min = 1 hour 39 min.).
Timing unit of SEC. or MIN. can be selected.  Pressing the "Start"  button the relay is on and the counter starts to count  down.
The 7-segment shows remaining time.   When the display reaches zero, the relay is off  and buzzer sounds

Applications : 
Darkroom timer. Egg timer,  ....  
PIC 16C54  datasheet