A burst pipe or a slow washing machine leak can cause thousands in damage before you even notice. The Tapo T300 is a straightforward solution: a water sensor that screams at 90 decibels when it detects moisture. That’s loud enough to hear from another floor, even over a running appliance.

The sensor runs on two standard AAA batteries and connects to your home Wi-Fi via the Tapo app. Once paired, it sends instant push alerts to your phone alongside the audible alarm. At IP66, it’s fully dust-tight and can handle powerful water jets, making it suitable for laundry rooms, basements, or even outdoor hose bibs. The tabletop design means you just set it on the floor near a water heater or under a sink. It works immediately.

The main limitation is the app ecosystem. Tapo devices require their own hub for some advanced automations, and the T300 relies on Wi-Fi for remote alerts. If your network goes down, you still get the local siren, but no phone notification. For the price, it’s a reliable early warning system that fills a critical gap in most smart homes.