The Skylink WA-MT Wireless Water Leak Sensor detects leaks in potential flood areas like basements, stairwells, hot water heaters, washing machine or under sinks. Prevent destruction of valuable or costly property damage with a push notification to your Smartphone. The Water Leak Sensor is operated by a single AAA Alkaline Battery (Sold Separately). Compatible with SkylinkNet Connected Home Security Alarm & Home Automation Systems and M-Series.