Automatic Drainage System Machine For Dental Air Compressor

●Features: Function: Button 1 set drainage cycle in days Button 2 set drainage cycle in seconds Button 1 corresponds the three lights: S is one day, L is three days, R is for sevenday,it is the meaning of when S indicator light,drain per one day,when L indicator light, drain per three days.When R indicator light,drain per seven days. Button 2 corresponds the three lights S for 5 sec,L for 10 sec,R for 30 sec,it means that when S light on,drainage time is 5 seconds,and so on