This leak detector lasts two years on a coin cell battery – Breaking News & Latest Updates 2026
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This leak detector lasts two years on a single battery.

The Shelly Flood S Gen4 is a $28 flood sensor that supports Matter, Wi-Fi, and Zigbee, so it should fit into any smart home setup. It also has a built-in alarm. Two-year battery life on a single CR123A is impressive; Ikea’s Klippbok leak sensor gets a year (but costs half as much). Wireless leak sensors are more flexible than wired models; you can just stick this under your washing machine, and you’re good to go.

Correction: This story previously said the sensor uses a coin cell battery; it’s a CR123A.

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<em>The Shelly Flood S is compact enough to fit under appliances.</em>
<em>It can connect to smart water shut-off valves through supported platforms to automatically turn off the water if a leak is detected. </em>
<em>The sensor uses three large stainless-steel sensors to create a wider contact area for detecting liquid.</em>
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The Shelly Flood S is compact enough to fit under appliances.
Image: Shelly
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