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Water Leak Sensor 1

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YoLink LoRa 1/4 Mile Long Range Smart Water Leak Sensor, EASY Installation, Alexa, IFTTT.  Hub Required - YoLink

DESCRIPTION: Our original and best-selling Water Leak Sensor 1 is a smart, wireless, "puck" type water detector, with water-sensing electrodes on the top and bottom, making it ideal for both dripping and pooling/flooding water. In addition to a 5+ year battery life, a unique feature of the sensor is its ability to be used repeatedly after getting wet, thanks to its IP67 waterproof rating. 

REQUIRED ITEMS: A YoLink hub with an internet connection is required for full functionality.  

Hand holding water leak detector 1 by YoLink.

set it & forget it!

The Water Leak Sensor 1 by YoLink 

Press the SET button to turn it on.

Scan the QR code with the app.

Name it and set your notification preferences.

Place it on the floor. Test it.


Plus, LoRa-based low-power wireless

can result in over 5 years between battery changes!

Suggested Locations

Popular locations to place your water leak detector 

Best Water Leak Detector for Range  

YoLink was the first to bring the advanced technology of LoRa® to the smart home market. Our water leak detectors offer the longest receiving range in the market of up to 1/4 mile range.

Superior Battery Life 

Save your time and money; while other leak detectors have a battery life lasting up to 1 or 2 years before they need to be replaced, YoLink’s low-power protocol allows for long range yet low-power smart water leak detectors, giving 5+ years of battery life!  

IP67 WaterProof Rating 

It may come as a surprise but many water leak detectors are not waterproof! The WLS1 is waterproof with a certified IP67 rating, which offers more protection than unrated or IP65/IP66-Rated products that are ‘water-resistant’. Our rating allows you peace of mind that you can reuse your sensor even if leaks happen. 

Compatible with Others

Be alerted with your smart home speaker at the first sign of a water alert! 

On vacation or not at home? You’ll still get instant notifications anywhere, anytime. 

Prevent leaks/flooding damage

Be informed immediately of off-normal environmental conditions, such as water from leaks or flooding, in your home and property, before expensive repairs are required

Wireless Water Leak Detector

Our water leak detectors are wireless, compact and easy to move, no 120V outlet or additional wiring required

Battery Powered & Portable

Uses standard alkaline batteries (2 AAA batteries); no Lithium or special batteries required

Integrity Monitoring

Smart Device Integrity Monitoring (S.D.I.M) means your smart device has 24/7 monitoring for communication and device health. Should your device fail to communicate or have a device health issue, you can be instantly notified (per your alarm strategy settings).  


(device-to-device pairing)

YoLink Control D2D device-to-device pairing allows for your water leak detectors to be paired to sirens and smart valves and valve controllers, or other devices, without an internet connection, and without power ("No WiFi, No Internet, No Power - No Problem!").

Enjoy functionality even during a power outage. Control-D2D paired devices will perform their paired function automatically, without an internet connection, without the app, and without AC power (in the case of battery-powered or battery-backed-up devices - an internet connection is required for full functionality and for the app to work.)

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YoLink Hub

First time with YoLink? Don’t forget your Hub 

To enjoy all the features of your water leak detector, it requires a connection to a YoLink hub (with an internet connection). While you can utilize Control-D2D to pair your leak sensors directly to sirens and smart valve products, these are intended to be "back-up" or supplemental configurations. Your hub will provide app functionality and allow for you to be informed of device health issues like low batteries. 

One Hub   

Connect to 300+ Sensors. 

One hub allows you essentially unlimited sensors connectivity.

No monthly fees, complicated wiring, or difficult installation. 

Unlock the full potential of a smart home with YoLink devices.

Easy D.I.Y. Installation 

Scan & Play

Water Leak Detector set up instructions Step 1 - Download YoLink App.
Water Leak Detector set up instructions Step 2 - Plug in hub.
Water Leak Detector set up instructions Step 2 - Plug in hub.

1) Download free App 

2) Plug in Hub and scan it’s QR code

3) Turn on and scan Water Leak Sensor

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Semtech® LoRa® RF Module YL09 microcontroller with 32-Bit RISC processor

User Visual Indicators:

Multi-color Status LED

User Control Interface:

SET Button

Power (Battery):

(2) AAA alkaline non-rechargeable batteries



IP Rating:


Dimensions, Imperial (Length x Width x Depth):

2.4 x 2. 4 x .96 inches

Dimensions, Metric (Length x Width x Depth):

62 x 62 x 24.5 mm

Operating Temperature Range:

-4°F to 122°F (-20°C to 50°C)

Water Leak Sensor 1 (Model YS7903)

  • "Puck" type water detector
  • Floor-mounted, optimized for dripping water as well as pooling/flooding water, thanks to sensors on the top and bottom and a cupped section to gather water on the top
  • Battery-powered (Two AAA batteries installed)
  • Extreme low power
  • 5+ years between battery changes
  • Extreme long range wireless
  • Up to 1/4 open-air range
  • No dependence on WiFi (uses LoRa technology)
  • Device-to-device pairing. Pair to smart valves, sirens, etc. (works without internet and without power)

  • Alexa voice assistant integration
  • IFTTT integration
  • Home Assistant integration
  • IP67 Rated waterproof - can be used again even after it gets wets (unlike some competitor products)
  • Simple "Set It  & Forget It" installation
  • Status LED
  • No audible sounder (See the Water Leak Sensor 4)
  • See the Leak Sensor 2 for rope type water sensors
  • 2 year manufacturer's warranty
  • See the product datasheet for full details


The package includes these items:

(1) Water Leak Sensor 1  (Model: YS7903)

(2) AAA Batteries

(1) Quick Start Guide

The following items are required for full device functionality:
YoLink Hub
or SpeakerHub 

Apple or Android phone or tablet  

We accept the following forms of payment for non-commercial purchases:

We accept the following forms of payments for direct, bulk, commercial, B2B purchases:

Check, e-check, bank transfer, Zelle, only.

The following shipping options are available for domestic (continental U.S. destinations):

USPS Economy, USPS Priority Mail, USPS Priority Mail Express, UPS Ground, UPS 2nd Day Air, UPS Next Day Air, UPS Next Day Air Saver

The following shipping options are available for international destinations:


Information regarding importing fees, tariffs, etcetera, can be found on the checkout page.

Questions? Email us at or call 831-292-4831

We are not happy until you are! Your purchase is protected by a 60 day returns and exchanges policy. Terms: RETURNS & EXCHANGES POLICY


The Water Leak Sensor 1 carries a 2 year manufacturer's warranty. Review and download the full warranty terms: WARRANTY POLICY PAGE

No subscription fees. 
There is no published maximum number of devices that can be added to one hub or one app!
YoLink devices are inter-compatible with all YoLink hubs and vice versa.

Free U.S. Shipping on Orders $50+ 

Hassle-Free Returns & Exchanges 

2-Year Warranty 

U.S. Phone Support 

YoLink's wireless smart water leak detector compatible 

with Alexa, IFTTT, Hub Required

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YoLink LoRa 1/4 Mile Long Range Smart Water Leak Sensor, EASY Installation, Alexa, IFTTT.  Hub Required - YoLink

Customer Reviews

Based on 14 reviews
Larry Hobbs
Easy to use

Very straightforward install

Pairing (p2p) with the Valve Controller

I’m happy with my purchase. However, I did have an issue with two of the water sensors which I managed to resolve.
After pairing all ten sensors and working with tech support all ten sensors detecting water turned off the water valve. A week later I went to show my neighbour how the sensor turns off the valve when it detects water and to my surprise the valve stayed on. I did receive an email, a text and an audible voice alarm that there is a leak detected and the valve is shut off. When I look at the app for the valve it shows the valve is still on and it’s also shows an alarm for the water sensor. I then tested all the sensors and two of the ten did not turn off the valve. I then paired the two water sensors as per the website and still the same issue. I then searched YouTube and found a video showing the valve should be in the off position before pairing the sensor to the valve controller, and now the two sensors work.
So I’m happing they work now but the website should be updated or the software should be updated. I will check in a few weeks to make sure all ten sensors are still working.

Kevin Fessler
YoLink Smart Water Devices

Clean, simple, efficient devices that provide valued, home protection. Love the operational capability even with power loss, and ability to control motorized water valve while anywhere in the world.

Wing Sung

Water Leak Sensor 1

Frederick Rosenau
They work

Have 5 sensors they have saved me a lot of grief.