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Water Leak Sensor

YoLink Water Leak Sensor, 1/4 Mile World’s Longest Range Smart Home Wireless Water Leak Sensor Compatible with Alexa IFTTT, Water Leak Detector with App Alerts and Remote Monitor – YoLink Hub Required

Bullet Points:

  • 10 times Longer Range – Powered by LoRa technology, YoLink brings the longest receiving range (1/4 mile) in the market. Our long coverage enables its use in hard-to-reach areas such as basement, porch, guest suite, barns, greenhouse, etc.
  • Work with Alexa – Get voice announcements when water leak detects; Immediate Alerts – Get instant APP notifications at the first sign of excess water or moisture to prevent leaks and flooding
  • 5 times Longer Battery life – Powered by 2 AAA included Alkaline batteries with 5 years of battery life compared to 1 year of other top brands; Battery status will be updated and low battery alert will be sent within YoLink APP
  • Work with IFTTT – Trigger event pipelines by using IFTTT, such as receiving Notifications, Emails, Calls, etc. when water leakage is detected
  • YoLink Hub Required but not included – YoLink Hub is the only central controller for YoLink devices. Without YoLink Hub, this sensor does not work on YoLink APP.


YoLink Technology
“YoLink” is a proprietary wireless technology provided by YoSmart. which is based on the Semtech’s LoRa wireless technology combined with the YoSmart smart home/building protocol, to provide the most advanced smart home/building devices solution. Compared to WIFI, Bluetooth, ZigBee, Z-Wave, and other smart home protocols, it has the advantages of low-power consumption, long-distance coverage (wall penetration), and anti-interference. It is the first smart building/home protocol that can be very easily setup and is a very low cost but creates a reliable, robust, and more secure IoT network.

Water Leak Sensor is widely used in water leak detection. There will have an alert when any of the three sets of probes were under the water. Download YoLink App, add Water Leak Sensor to your smart home system, which will able to monitor your home’s security in real-time.
With Yolink APP and Hub, you can also control or monitor all YoLink smart home devices, such as plugs, switches, locks, gas/water Valves, sensors, and more. You can set scenes, automation, and YoLink Control between devices and devices, making your house smart. In all, you can build your own smart home system with YoLink.

1. A YoLink Hub, Link: YS1603-UC YoLink Hub
2. The smartphone or tablet able to run iOS 9 or higher, Android 4.4 or higher.



  • Real-time Status – Monitor the real-time state of water leak via YoLink App.
  • Battery Status – Update battery level and send low battery alert.
  • YoLink Control – Trigger an action of certain YoLink devices without the internet.
  • Automation – Set up rules for “If this then that” function.


  • Product Model: YS7903-UC
  • Voltage: 3V DC (2* AAA battery)
  • Working Temperature: 0°C~50°C (32°F~122°F)
  • Working Humidity: ≤100%RH (non-condensing)

Package Content:

  • 1 x YoLink Smart Water Leak Sensor
  • 1 x Quick Start Guide  (please click User Guide YS7903-UC for a detailed electrical user guide.)

Please Note:

  • YoLink Hub is required and it supports Wired Connection and 2.4G WiFi Connection.
  • YoLink products only work in the USA and Canada.