WaterBug model WB-350 has it's own 9 volt battery and chime. It is excellent as a stand-alone alarm to audibly alert you when it detects water. The WaterBug will notify you of leaks, water rising and drips before they become big floods.
As many as 6 sensor probes (#60-553 & #60-554) can be run up to hundreds of feet away. Each sensor has surface contacts that detect the first appearance of water forming a film on the floor. The sensor will not alarm due to condensation or high humidity. Includes one standard surface sensor.