Features: 1) Operational principle: based on liquid conduction principle, use the electrode to detect whether there is water, then transform to main contact output by sensor 2) Functions and technical features: a) Have the function of field warning indication to better measuring and testing, be instructed with the diode, green light showing normal while red light showing warning b) Have two output states: normally open and normally close (normally open as usual), contact capacity is DC30V, 1A c) Working power supply: DC 12V with the function of power protection d) Power consumption: