Pressing the "Start" button turns on a relay for a fixed duration (set by the potentiometer).
Timing operation can be manually terminated at any time by pressing the "Reset" button.
Slide switch (S1) sets the range : from 0.5 sec. to 50 sec. -or- from 1 sec. to 100 sec.
Applications : General purpose timer, pvc bags sealing machine timer, game timer, ...