Shelly Flood S Gen4

Shelly Flood S Gen4 is a compact water sensor built for one job: spotting leaks fast, before a small drip turns into a soaked floor and a big repair bill. It uses large stainless steel sensing surfaces to detect water quickly and reliably, which makes it a strong fit for places where leaks tend to sneak up on you, like under sinks, behind washing machines, or near water heaters. The built-in light and sound alarm gives you an immediate heads-up on site, while smartphone notifications keep you informed even when you are not home.

What makes this model stand out is the way it balances fast response with practical battery use. Its three alarm profiles let users choose how aggressively the device reacts, depending on the space and the level of risk. On the smart home side, it supports Matter and connects over Wi-Fi, Zigbee, and Bluetooth, so it can slot into Shelly setups as well as broader smart home systems without feeling boxed in. Small device, serious purpose; that is really the story here.