Can be used with all Sensaphone® models to detect the presence of water on a horizontal or vertical surface. Up to 6 sensors (#60-553 & #60-554) may be added to the controller which is wired to an input of any Sensaphone Dialer. Requires 12 VDC power source. WaterBug model WB-200 has a Form C relay output (it does not have it's own audible alarm) and requires a 12-24 DC supply. It is ideal for connecting to alarm panels, Sensaphone dialers, our property paging system, bells, strobes, buzzers etc.