Water Leak Detection - Anywhere. Help save your home from potential damage with the Resideo L1 WiFi Water Leak and Freeze Detector. 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 notifications, 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. Easy to install and WiFi-ready, the water leak detector integrates with other Resideo WiFi water leak detectors creating a water leak detection system.