Electronic Moisture Detector Senses Non-Flammable Conductive Liquids Connect up to 8 supervised or 16 unsupervised WaterBug sensors Built-in audible alarm with silence feature One 'Form C' SPDT relay for an alarm output Accepts 12V and 24V AC/DC connections Note:Product isn't stocked in our warehouse but generally ships direct from the manufacturer 5-15 days after the order is placed. Ground delivery only. Expedited shipping methods (i.e.: next-day, 2-day, 3-day select, etc.) are not available on these products. Direct Ship items are not eligible for return and only eligible for exchange if defective. Get advance notice of potentially hazardous water leaks in your home or office with a system that alerts you when water buildup is detected. The Waterbug 800 8-Zone Water Sensor Alert Kit can monitor up to eight supervised or 16 non-supervised zones; four supervised sensors are included, additional WaterBug Surface Sensors are available separately. The sensors detector work by forming a conductive bridge between two electrical contacts when it senses the presence of non-flammable conductive liquids. When water or moisture has been detected the main unit will alarm or trigger a relay on virtually any alert/security system such as EnviroAlert or automation system such as INSTEON that accepts a dry contact closure. This water sensor kit is ideal for bathrooms, laundry rooms, basement sump pumps, drain areas, computer rooms, document storage areas, warehouses and sprinkler systems.