Zircon"s leak alert electronic water detector is now available in a three pack which also includes three 9-volt batteries for immediate use. Zircon"s leak alert is perfect for use near water heaters, sinks, dishwashers, sump pumps, and more. Protect your home from water damage by placing leak alert anywhere the potential for flooding or leaks exist.Loud (95dB) alarm sounds with direct water contactFully automatic operation, no wiring requiredFloats and signals for up to 72-hoursLow battery warning for optimum performanceIncludes three leak alert units, two 9-Volt batteries and detailed instructions