Compact, sleek, and highly responsive, this smart detector is your first line of defense against leaks and flooding. Whether installed in a kitchen, bathroom, basement, or laundry area, it works seamlessly with your smart home system to deliver instant alerts and peace of mind.
Key Features
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💧 Instant Leak Detection
Detects water leaks in real-time, helping prevent property damage and costly repairs. -
📱 Smartphone Notifications
Sends immediate alerts to your phone so you can act quickly, even when you’re away. -
🏠 Smart Home Integration
Easily connects with the SwitchBot ecosystem and other smart home platforms for centralized control. -
🔋 Long-Lasting Battery
Designed for extended battery life, reducing the need for frequent replacements. -
🧩 Discreet, Compact Design
Small and sleek in white, it fits inconspicuously in tight or hidden spaces. -
🔧 Easy Installation
Tool-free setup—just place it where leaks are most likely to occur.
The SwitchBot Smart Home Water Leak Detector W4402000 is an essential device for every home. Simple to install, smart-enabled, and highly sensitive, it delivers 24/7 protection with zero hassle. Invest in proactive home safety today and enjoy prompt alerts and lasting peace of mind.


Made Wi-Fi ready, for a better kind of
Water Leak Detector.

Monitor potential leaks around your entire home from anywhere. No hub needed.*
Receive real-time alerts when going out or on vacation, and view records of water leakage incidents to remind family members to prevent floods before they occur.
*Supports Bluetooth and Wi-Fi connectivity.


Wider Wi-Fi coverage.
There is no limit to the number of Water Leak Detector devices that can be added to our app, and wide Wi-Fi coverage* enables you to know what’s happening when it comes to leaks at home, all in the palm of your hand.
*In open and unobstructed areas, communication distance between your device and Wi-Fi router can be up to 120m.

4 types of alarms to make sure you’re always aware.
Get sound alerts, app notifications, Alexa voice alarms, and emails to make sure you’re always aware of what’s happening at home.





IP67 waterproof.
With its fully-sealed waterproof shell, Water Leak Detector can easily cope with high humidity working environments. Even when soaked in water*, it can still send out notifications normally and can even be reused after drying.
*Immersed in water at a depth of 1 meter for no more than 30 minutes.
2-Year Battery Life
With 2 x AAA batteries (included), you’ll only need to replace batteries once every 2 years.
*When used in Standy-by Mode, actual battery life performance may vary depending on use.



























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