---
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: "605 DH"
currency: MAD
in_stock: true
reviews_count: 8
category: "Yo Link"
url: https://www.desertcart.ma/products/263333438-water-leak-sensor-2-1-4-mile-worlds-longest-range
store_origin: MA
region: Morocco
---

# 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:** 605 DH
**Availability:** ✅ In Stock

## Summary

> 🚨 Leak-proof your lifestyle with the world’s longest-range water sensor!

## 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?** 605 DH with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/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 That Lasts:** Over 2 years of battery life means set-and-forget peace of mind for busy pros.
- • **Customizable Rope Sensor:** 4.2 ft extendable cable adapts to tight spots and critical zones like dishwashers or water heaters.
- • **Unmatched Long-Range Detection:** Covers up to 1,320 feet open air with LoRa tech—stay protected beyond WiFi limits.
- • **Instant Alerts with Alexa & IFTTT:** Seamlessly integrates with smart home ecosystems for real-time leak notifications anywhere.
- • **Fail-Safe Device-to-Device Pairing:** Operates independently of WiFi, internet, or power outages—always on guard.

## Overview

The YoLink Water Leak Sensor 2 offers industry-leading 1/4 mile LoRa wireless range and a powerful 105dB siren to detect leaks early. Featuring a 4.2-foot extendable rope sensor and over 2 years of battery life, it ensures reliable, WiFi-independent operation through patented device-to-device pairing. Compatible with Alexa and IFTTT, it requires the YoLink Hub for seamless smart home integration, making it the ultimate proactive water damage defense for modern homes.

## Description

Buy 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: Replacement Parts - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Water Leak Detected in Crawlspace - Great Product(s) - I do not often write reviews, but the YoLink sensors have been a great addition. Today, 12/3/2023, I was out and about. I received a notification on my phone that a leak was detected in the crawlspace. When I got home and went into the crawlspace I found water in the reported location (I use a naming convention so I know the type and location of the sensors). The leak was a slow drip and the water had pooled. Once the "tail" of the S2 sensor was wet I received the alert. This was a very slow leak and it took some time for the water to build up to touch the "tail". Sometimes it is hard to get the tail to lay perfectly flat. I try to place them in lower areas too. Perhaps if a simple change like rolling the "tail" sensor vs folding them would help, but I really can't complain. They are easy enough to straighten out. I mean how many times to do go into the crawlspace in a give year. A handful? So these play an important role in being proactive. I have looked at other sensors that are cheaper, but I do like the ecosystem and they are very reliable. I have water sensors (S1's and S2's) at key points in the crawlspace to detect this very thing. The battery life is amazing. They have been deployed for over a year and they still report having full batteries. It would have take a long time for us to know that we had a slow leak. That is if we found it in the first place. Like I said before we do not often go into the crawlspace or attic. So for what is worth these add value. I do wish they were priced a bit lower though. In my case I have Yo-Link sensors in the following areas: 1) S1 - Crawlspace 2) S2 - Crawlspace 3) Motion Sensor - Mailbox 4) Temp and Humidity - Crawlspace (to help monitor the duhimidifier) and Attic 5) Outdoor Power Outlet - This allows for the remote control of the pump in the water feature (schedule control). Last year the water froze and part of the feature broke and had to be replaced. So I got this and am able to change the schedule when it is going to freeze. On the second plug I put an aquarium water heater stick that I can turn on to help keeping the water to freeze. The combination was way cheaper than other options. 6) Vibration Sensor (available on the YoLink site) - I am going to buy one of these to put on the dehumidifier in the crawlspace. We had an error that we did not notice for about two weeks. This can trigger an alert in the absence of any vibration. I am going to give this a shot too once I save some money.
Review: Fantastic company with great products. - I have found YoLink products to be reliable, cost effective and intuitive to use as well as having powerful customizable features. In the few cases where I have needed help for more complex settings, the customer service line answers quickly and is very competent in explaining the solution. YoLink is that rare company that has great products with great customer service. When I had a problem with a hub going offline, YoLink sent me a replacement upgraded hub immediately. I have recommended YoLink for water and temperature/humidity alarms for my Florida and Minnesota condominium associations.

## 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 |
|---------------|-------|
| Battery Description | Not Specified |
| 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 |

## 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 **Style** 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 Leak Detected in Crawlspace - Great Product(s)
*by H***R on December 3, 2023*

I do not often write reviews, but the YoLink sensors have been a great addition. Today, 12/3/2023, I was out and about. I received a notification on my phone that a leak was detected in the crawlspace. When I got home and went into the crawlspace I found water in the reported location (I use a naming convention so I know the type and location of the sensors). The leak was a slow drip and the water had pooled. Once the "tail" of the S2 sensor was wet I received the alert. This was a very slow leak and it took some time for the water to build up to touch the "tail". Sometimes it is hard to get the tail to lay perfectly flat. I try to place them in lower areas too. Perhaps if a simple change like rolling the "tail" sensor vs folding them would help, but I really can't complain. They are easy enough to straighten out. I mean how many times to do go into the crawlspace in a give year. A handful? So these play an important role in being proactive. I have looked at other sensors that are cheaper, but I do like the ecosystem and they are very reliable. I have water sensors (S1's and S2's) at key points in the crawlspace to detect this very thing. The battery life is amazing. They have been deployed for over a year and they still report having full batteries. It would have take a long time for us to know that we had a slow leak. That is if we found it in the first place. Like I said before we do not often go into the crawlspace or attic. So for what is worth these add value. I do wish they were priced a bit lower though. In my case I have Yo-Link sensors in the following areas: 1) S1 - Crawlspace 2) S2 - Crawlspace 3) Motion Sensor - Mailbox 4) Temp and Humidity - Crawlspace (to help monitor the duhimidifier) and Attic 5) Outdoor Power Outlet - This allows for the remote control of the pump in the water feature (schedule control). Last year the water froze and part of the feature broke and had to be replaced. So I got this and am able to change the schedule when it is going to freeze. On the second plug I put an aquarium water heater stick that I can turn on to help keeping the water to freeze. The combination was way cheaper than other options. 6) Vibration Sensor (available on the YoLink site) - I am going to buy one of these to put on the dehumidifier in the crawlspace. We had an error that we did not notice for about two weeks. This can trigger an alert in the absence of any vibration. I am going to give this a shot too once I save some money.

### ⭐⭐⭐⭐⭐ Fantastic company with great products.
*by H***S on August 26, 2025*

I have found YoLink products to be reliable, cost effective and intuitive to use as well as having powerful customizable features. In the few cases where I have needed help for more complex settings, the customer service line answers quickly and is very competent in explaining the solution. YoLink is that rare company that has great products with great customer service. When I had a problem with a hub going offline, YoLink sent me a replacement upgraded hub immediately. I have recommended YoLink for water and temperature/humidity alarms for my Florida and Minnesota condominium associations.

### ⭐⭐⭐⭐⭐ 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.

## 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 Morocco*
*Store origin: MA*
*Last updated: 2026-03-09*