Water sensor provides early detection of water leaks or freezing conditions, so you can take steps to avoid damage Detects freezing conditions when temperature reach 37 degrees Fahrenheit or when there is a rapid temperature drop Battery powered: 2 AA batteries are included for simple operation & replacement Sleek & small design allows for placement next to dishwashers, refrigerators, water heaters, toilets, or under sinks - ideal for use in basements or garages WiFi-enabled technology allows notifications to be sent to your smartphone (as well as friends & family) in the event of a water leak or freeze hazard in your home Easy setup & installation: download the Kidde app, scan the QR code on the device, & follow the step-by-step instructions Compatible with Amazon Alexa, Google Home, iPhone, & Android smart devices 1-year limited manufacturer warranty on alarm only - warranty begins when the alarm is powered on - if that date is unknown, it should be assumed that replacement is needed.