---
product_id: 263333438
title: "Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC"
brand: "yolink"
price: "184.26 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Yo Link"
url: https://www.desertcart.tn/products/263333438-water-leak-sensor-2-1-4-mile-worlds-longest-range
store_origin: TN
region: Tunisia
---

# 1/4 mile LoRa range 2+ year battery life 105dB built-in siren Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC

**Brand:** yolink
**Price:** 184.26 DT
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay dry, stay ahead — the leak sensor that never sleeps!

## Quick Answers

- **What is this?** Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC by yolink
- **How much does it cost?** 184.26 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/263333438-water-leak-sensor-2-1-4-mile-worlds-longest-range)

## Best For

- yolink enthusiasts

## Why This Product

- Trusted yolink brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power Outage Proof:** Device-to-device pairing keeps your alerts live even when WiFi, internet, or power fail.
- • **Plug & Play Smart Setup:** Scan & Play QR code app integration means zero hassle installation—get protected in minutes.
- • **Seamless Smart Home Sync:** Works with Alexa & IFTTT for instant voice alerts and automated leak response routines.
- • **Expandable Sensing Coverage:** 4.2 ft rope-style sensor cable with add-on capability for custom leak zones under sinks or around heaters.
- • **Unmatched Long-Range Detection:** LoRa wireless tech covers up to 1/4 mile open-air—protect your entire property effortlessly.

## Overview

The YoLink Water Leak Sensor 2 offers industry-leading 1/4 mile LoRa wireless range and 2+ year battery life, ensuring reliable water leak detection without relying on WiFi or power. Featuring a 4.2-foot rope-style sensor cable that can be extended for precise coverage, it includes a loud 105dB siren and integrates seamlessly with Alexa and IFTTT. Quick to install via QR code scanning, it requires the YoLink Hub for operation and guarantees continuous protection even during internet or power outages.

## Description

STATE-OF-THE-ART Smart Water Leak Detection: LoRa-based 1/4 mile open-air range, 2+ year battery life, no dependence on WiFi, device-to-device pairing provides functionality even with the loss of AC and/or internet! ROPE STYLE water-sensing cable, 4.2 feet (1.2 meter) long, additional cables can be added, for detection in confined spaces, such as under a dishwasher, and for defining specific detection areas, such as encircling a water heater THAT WAS EASY! Installs quickly and easily, thanks to Scan & Play QR-code scanner feature in the app, easy wall-mounting, and no requirement to plug the sensor into an AC outlet. NO WIFI, NO INTERNET, NO POWER? NO PROBLEM! Our patented Control-D2D device-to-device pairing, over our LoRa-based wireless network, allows for devices to be paired to each other, in such a way they will continue to operate, even if WiFi is flaky, the internet goes down, or the AC power goes out! A YoLink hub is REQUIRED! This device will not operate without a Hub, not included. Please search for B09FSS95G9 for a SpeakerHub (our audio, talking hub) or B07TQLKQLJ for the original Hub

Review: Water Level Sensor is an elegant method for monitoring my sump pumps - I've been a little paranoid about my sump pump recently. I have three pumps in my sump well, a primary pump with its built-in vertical float sensor, a secondary backup pump with a vertical float sensor positioned so that it will not activate unless the primary pump stops working, and a 12-volt pump that runs off a 100 amp-hour AGM battery kept charged using a battery tender. This 12-volt sump pump is my pump of last resort in case of a power outage, and its float will not activate unless the sump water level gets above both the primary and secondary pumps. With this setup, it's not easy to tell when my primary sump pump stops working. This YoLInk Water Leak Sensor 3 solves this problem. The sensor comes with a water sensor probe, which I did not use. For sump wells, they suggest that you use a float switch instead of the included probe since the probe terminals could become covered with mineral deposits and reduce their water detection sensitivity. I ordered the 'Level Sense 15 Feet Water Level Float Switch with Mounting Bracket' from desertcart and it works perfectly for this sump well application. I just had to wire in a standard 3.5mm male plug to the end of the float switch wires to be able to plug into the YoLInk Water Leak Sensor. The YoLink Water Leak Sensor requires the use of an inexpensive central hub (I bought the YoLInk SpeakerHub). It communicates with the hub by use of a long-range radio that has up to a 1/4 mile range and uses very little power. The two standard AA batteries in the Water Leak Sensor should last for one to two years. Setup was quick and easy. You just install the YoLink App onto your cell phone, plug in the hub anywhere in your house, and connect it to your home WiFi. Then you can easily add the Water Leak Sensor to your system by scanning the QR code on the sensor. The YoLink ecosystem has many different types of sensors, alarm speakers, switches, etc. for constructing very elaborate home automation systems. This Water Leak Sensor is a good introduction to this ecosystem, and I'll certainly be considering other home automation options. I attached the small Water Level Float Switch in my sump well so that it would not activate unless the sump water level rose above the normal maximum level permitted by my primary sump pump (but below the level where my secondary sump pump would activate). Now, if my primary sump pump stops working, I receive both an email alert as well as an app notification on my cell phone letting me know that the primary sump pump has stopped working. You can also set up the app to text you an alert, which I have not yet done since you are limited to 25 free SMS texts per month. Since the YoLInk system is compatible with Alexa, I also have all my Alexa devices announce that my primary sump pump has stopped working (easily done with an Alexa routine). In addition, I have set up my YoLInk system to notify me when the float switch opens back up, since this tells me that my secondary pump has run successfully, giving me peace of mind. The YoLInk Water Level Sensor is an elegant method by which to monitor my sump pumps. Now, no matter where I am, I'll know if my primary pump has failed and needs attention as well as whether my secondary backup pump has successfully run. I'm also impressed with the entire YoLInk ecosystem.
Review: Unique Sensor That Works Excellent - This sensor, that can work by itself or also works along with the YoLink suite of sensors is unique in that it uses a cloth like braided material surrounding a long sensor element that when the second it gets wet sounds an audible alarm and if you have it configured with their app it will send you text and / or email alerts every 5 minutes or so. You can place it around the bottom of a water heater or sink cabinet or A/C pan to cover a larger area so a leak can be detected as early as possible. If you need to cover a larger area you can link more sensor cables together, although I have not tried this or have not seen where you buy extra lengths of sensor cable. Of course, I did test the sensor and it reacts to even a drop of water and once the sensor cable gets wet is will alarm for quite a while even if you have tried to dry it with a towel. So I thought since this was just a test that I would just unplug the sensor cable and wait for it to dry out,,,, at which point, it started sending me texts every five minutes that the sensor cable was unplugged. Now while annoying, I thought that was pretty genius on the designers part since you would really like to know if the sensor had become unplugged (Think, for example, if you had moved some items underneath a sink and it pulled it out), well the sensor would no longer be viable but you wouldn't know until the water was running across the floor. Not with this little device as it will send you a notification. I have only had the system in place for two months (they also have other sensors available) and the battery levels are all still indicating full so I have not seen how well that feature works as it is supposed to track the battery level of the sensors. ( not sure if it sends an alert about low battery level) All in all, this is a slick set of sensors and while the app is a little bit clunky to get everything named and organized, once it is setup it is transparent. I hope this company can stay around to help support their product and possibly add other sensors to their repertoire.

## Features

- STATE-OF-THE-ART Smart Water Leak Detection: LoRa-based 1/4 mile open-air range, 2+ year battery life, no dependence on WiFi, device-to-device pairing provides functionality even with the loss of AC and/or internet!
- ROPE STYLE water-sensing cable, 4.2 feet (1.2 meter) long, additional cables can be added, for detection in confined spaces, such as under a dishwasher, and for defining specific detection areas, such as encircling a water heater
- THAT WAS EASY! Installs quickly and easily, thanks to Scan & Play QR-code scanner feature in the app, easy wall-mounting, and no requirement to plug the sensor into an AC outlet.
- NO WIFI, NO INTERNET, NO POWER? NO PROBLEM! Our patented Control-D2D device-to-device pairing, over our LoRa-based wireless network, allows for devices to be paired to each other, in such a way they will continue to operate, even if WiFi is flaky, the internet goes down, or the AC power goes out!
- A YoLink hub is REQUIRED! This device will not operate without a Hub, not included. Please search for B09FSS95G9 for a SpeakerHub (our audio, talking hub) or B07TQLKQLJ for the original Hub

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08P1WD66X |
| Brand | YoLink |
| Brand Name | YoLink |
| Customer Reviews | 4.6 out of 5 stars 993 Reviews |
| Item Dimensions | 3.27 x 0.59 x 1.22 inches |
| Item dimensions L x W x H | 3.27 x 0.59 x 1.22 inches |
| Manufacturer | YOSMART |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Supply Voltage | 3 Volts (DC) |
| Measuring Range | 32°F - 122°F |
| Model | YS7904-UC |
| Mounting Type | Wall Mount |
| Output Type | Digital |
| Part Number | YS7904-UC |
| Sensing Distance | 0.25 Miles |
| Smart Home Compatibility | Smart Home Compatible |
| Specific Uses For Product | Amateur, Inside, Professional |
| Style | Without Hub |
| Style Name | Without Hub |
| UPC | 850024791091 |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 122 Degrees Fahrenheit |
| Warranty Description | 2 Years |

## Product Details

- **Brand:** YoLink
- **Color:** White
- **Compatible Devices:** Android Phone, iPhone
- **Power Source:** Battery Powered
- **Product Dimensions:** 2.44"L x 2.44"W x 0.8"H

## Images

![Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC - Image 1](https://m.media-amazon.com/images/I/51xkkGlZDWL.jpg)

## Available Options

This product comes in different **Set** options.

## Questions & Answers

**Q: Does the entire cable detect water or just the tip on the end?**
A: The sensor cable of the YoLink Water Leak Sensor 2 detects water along the length of the cable. For more information, please kindly refer to the following guide http://www.yosmart.com/support/YS7904-UC/docs/instruction

**Q: I plan to submerge v3 type of the sensor in the sump pump. I wonder if the "dirty" water will corrode/damage the sensor?**
A: It is possible for the probe cable to get a build-up that can slow the response time, particularly slow drying (as the gunk on it might hold moisture). For this application, I recommend wiring our sensor to a float switch. It will work great, even in a dirty water environment. 

We do not suggest any particular model. Most of them are interchangeable by flipping the float around 180° but you want one that has closed contacts when in the water-detected/high position, for it to give you a "water detected" indication on the app. It is possible to work with the opposite (open) and get the desired response and notifications in automation settings but the app will display it as no-water when you have water at the float. 

Eric with YoSmart

**Q: How many sensors can i "pair" with one hub? i have 3 basements that i need to monitor. or do i need a hub for each sensor?**
A: 128 pairs!

You will need a hub at each building, but unless you have a very large building, or a lot of RF obstructions, you should be fine with just one hub. 

Eric with YoSmart

**Q: Will laying this cable on a conducting metal surface trigger the alarm? I.e. inside a water heater pan?**
A: No, the metal will not impact its operation. Do keep in mind, the sensor body should not get wet. That has to stay outside the pan. You might consider instead our Water Leak Sensor 1. You can look at customer-submitted photos and find several instances of this sensor being placed in a water heater or air conditioner pan. 

https://www.amazon.com/dp/B07Z7QWJBP?ref=myi_title_dp&th=1

## Customer Reviews

### ⭐⭐⭐⭐⭐ Water Level Sensor is an elegant method for monitoring my sump pumps
*by D***E on February 28, 2023*

I've been a little paranoid about my sump pump recently. I have three pumps in my sump well, a primary pump with its built-in vertical float sensor, a secondary backup pump with a vertical float sensor positioned so that it will not activate unless the primary pump stops working, and a 12-volt pump that runs off a 100 amp-hour AGM battery kept charged using a battery tender. This 12-volt sump pump is my pump of last resort in case of a power outage, and its float will not activate unless the sump water level gets above both the primary and secondary pumps. With this setup, it's not easy to tell when my primary sump pump stops working. This YoLInk Water Leak Sensor 3 solves this problem. The sensor comes with a water sensor probe, which I did not use. For sump wells, they suggest that you use a float switch instead of the included probe since the probe terminals could become covered with mineral deposits and reduce their water detection sensitivity. I ordered the 'Level Sense 15 Feet Water Level Float Switch with Mounting Bracket' from Amazon and it works perfectly for this sump well application. I just had to wire in a standard 3.5mm male plug to the end of the float switch wires to be able to plug into the YoLInk Water Leak Sensor. The YoLink Water Leak Sensor requires the use of an inexpensive central hub (I bought the YoLInk SpeakerHub). It communicates with the hub by use of a long-range radio that has up to a 1/4 mile range and uses very little power. The two standard AA batteries in the Water Leak Sensor should last for one to two years. Setup was quick and easy. You just install the YoLink App onto your cell phone, plug in the hub anywhere in your house, and connect it to your home WiFi. Then you can easily add the Water Leak Sensor to your system by scanning the QR code on the sensor. The YoLink ecosystem has many different types of sensors, alarm speakers, switches, etc. for constructing very elaborate home automation systems. This Water Leak Sensor is a good introduction to this ecosystem, and I'll certainly be considering other home automation options. I attached the small Water Level Float Switch in my sump well so that it would not activate unless the sump water level rose above the normal maximum level permitted by my primary sump pump (but below the level where my secondary sump pump would activate). Now, if my primary sump pump stops working, I receive both an email alert as well as an app notification on my cell phone letting me know that the primary sump pump has stopped working. You can also set up the app to text you an alert, which I have not yet done since you are limited to 25 free SMS texts per month. Since the YoLInk system is compatible with Alexa, I also have all my Alexa devices announce that my primary sump pump has stopped working (easily done with an Alexa routine). In addition, I have set up my YoLInk system to notify me when the float switch opens back up, since this tells me that my secondary pump has run successfully, giving me peace of mind. The YoLInk Water Level Sensor is an elegant method by which to monitor my sump pumps. Now, no matter where I am, I'll know if my primary pump has failed and needs attention as well as whether my secondary backup pump has successfully run. I'm also impressed with the entire YoLInk ecosystem.

### ⭐⭐⭐⭐⭐ Unique Sensor That Works Excellent
*by D***K on February 27, 2024*

This sensor, that can work by itself or also works along with the YoLink suite of sensors is unique in that it uses a cloth like braided material surrounding a long sensor element that when the second it gets wet sounds an audible alarm and if you have it configured with their app it will send you text and / or email alerts every 5 minutes or so. You can place it around the bottom of a water heater or sink cabinet or A/C pan to cover a larger area so a leak can be detected as early as possible. If you need to cover a larger area you can link more sensor cables together, although I have not tried this or have not seen where you buy extra lengths of sensor cable. Of course, I did test the sensor and it reacts to even a drop of water and once the sensor cable gets wet is will alarm for quite a while even if you have tried to dry it with a towel. So I thought since this was just a test that I would just unplug the sensor cable and wait for it to dry out,,,, at which point, it started sending me texts every five minutes that the sensor cable was unplugged. Now while annoying, I thought that was pretty genius on the designers part since you would really like to know if the sensor had become unplugged (Think, for example, if you had moved some items underneath a sink and it pulled it out), well the sensor would no longer be viable but you wouldn't know until the water was running across the floor. Not with this little device as it will send you a notification. I have only had the system in place for two months (they also have other sensors available) and the battery levels are all still indicating full so I have not seen how well that feature works as it is supposed to track the battery level of the sensors. ( not sure if it sends an alert about low battery level) All in all, this is a slick set of sensors and while the app is a little bit clunky to get everything named and organized, once it is setup it is transparent. I hope this company can stay around to help support their product and possibly add other sensors to their repertoire.

### ⭐⭐⭐⭐⭐ So good, just do it
*by B***N on May 28, 2026*

The rope is very sensitive and reusable. The range will be reduced by walls and other obstructions. A couple of my sensors are at their range limit at 400 feet through building walls and nestled beside equipment. Overall a well built product and great value. I now have 11 installed in my apartments and already one has help me respond quickly and avoid expensive damage repair.

## Frequently Bought Together

- YoLink Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC
- YoLink 10 Foot Sensor Cable Water Leak Sensor 2

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-06-21*