New digital technological uses the patented Mirus field effect dector cells producing micro-electrical fields that detect disruptions caused by water and fluids. Detector cells are totally sealed and are never in contact with the water, they will not corrode and are not affected by oil or foreign debris. No moving parts - Totally sealed solid state electronics and field detectors. No mercury and no exposed sensors eliminate corrosion possibilities and makes it environmentally friendly. Activates at a 50mm (2") fuild level and deactivates at a 20mm 3/4") fluid level. A three second delay prevents false starts. Rated to handle pumps up to 20 amps at 12 or 24 volts.