Moen 920-004 Smart Leak Detector, 1 Pack.

The Smart Leak Detector is a standalone sensor that can be placed anywhere in a home to alert you when and where it detects moisture to help prevent water damage and loss. If the Smart Leak Detector senses the presence of water, extreme temperatures or high humidity, it will alert you in one or more ways, according to set preferences: Moen Smart Water App, text, phone call or email.