For the price, they are good. A TP-Link hub is essential for notifications and automation; otherwise, they work autonomously with a siren. They have contacts on the top and bottom and are very sensitive. I have placed several in the house at various points and programmed them to command the water supply to shut off with an electric valve if they detect a leak. It connects perfectly with Home Assistant and also with Samsung's SmartThings. Google Home recognizes them, but you can't use them in automation like I do with the electric valve. They may fix this in a future version.

Very good device.
Ideal for water leak alarm. It just needs a HUB to connect to the Tapo tp link app.

Although there hasn't been any leakage yet, it is small, user-friendly, and in the tests I conducted, it sounded normal.