Guardian is a system of Leak Detectors and a Valve Controller 

 PREVENT WATER DAMAGE - Install in minutes and never worry about water damage again. Guardian will automatically close your water main when Leak Detectors sense leaks, freezing temperatures, or earthquakes. Use the iOS & Android app, with no monthly service fees, to monitor and control your system from anywhere in the world.

• Install in minutes
• Will automatically close your water main when the Leak Detector senses leaks, freezing temperatures, or earthquakes
• Use the iOS & Android app, with no monthly service fees, to monitor and control your system from anywhere in the world
• Valve Controller easily installs over existing quarter-turn metal ball valve from ½" - 1" without any tools
• The Valve Controller will even test your valve every week to make sure it is working properly during an emergency, and it will alert you if anything goes wrong