Flood Buzz has been selling these simple alarms since 2010. The Blue Model’s main advantage is its zero-setup design. It arrives with the battery already installed, so you can pull it from the box and place it immediately.

You set it flat on the floor in a critical spot, like under a water heater or washing machine. Its low-profile shape fits inside standard water heater pans. When water touches its two contact sensors, a 110-decibel alarm fires. That sound is genuinely jarring—comparable to a close car horn—and it will get your attention from another room.

This is a single-purpose, no-frills tool. There are no smart alerts or connectivity features. You rely entirely on hearing the local alarm, so it’s not suitable for unattended vacation homes. For a basic, reliable acoustic alert where water damage starts, it delivers a straightforward solution.