Be prepared and alerted Even when you’re away, the reliable L1 WiFi Water Leak and Freeze Detector monitors temperatures and can warn you of leaks. This compact, smart device sends mobile push and email notification, alerting you to water leaks, freezing temperatures and humidity out of the set range. The water leak detector is designed to help you avoid potential water damage and costly repairs. Easily pair one or more Resideo WiFi Water Leak Detectors with the L5 WiFi Water Leak Shutoff Valve to shut off water at the source when a leak is detected, providing a complete home water control system.