---
product_id: 304912617
title: "Water Leak Sensor 2,1/4 Mile World'S Longest Range Smart Home Sensor,Water Detector With Built-In Siren Up To 105Db,Works Alexa And Ifttt-Yolink Hub Required,Ys7904-Uc"
brand: "yolink"
price: "€ 74.10"
currency: EUR
in_stock: true
reviews_count: 5
category: "Yo Link"
url: https://www.desertcart.es/products/304912617-water-leak-sensor-2-1-4-mile-worlds-longest-range
store_origin: ES
region: Spain
---

# 1/4 mile LoRa range 2 AAA batteries included 105dB built-in siren Water Leak Sensor 2,1/4 Mile World'S Longest Range Smart Home Sensor,Water Detector With Built-In Siren Up To 105Db,Works Alexa And Ifttt-Yolink Hub Required,Ys7904-Uc

**Brand:** yolink
**Price:** € 74.10
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of leaks with the world’s longest-range smart water sensor!

## Quick Answers

- **What is this?** Water Leak Sensor 2,1/4 Mile World'S Longest Range Smart Home Sensor,Water Detector With Built-In Siren Up To 105Db,Works Alexa And Ifttt-Yolink Hub Required,Ys7904-Uc by yolink
- **How much does it cost?** € 74.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/304912617-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

- • **Instant Flood Alerts:** Built-in 105dB siren plus real-time smartphone notifications ensure you’re the first to know about leaks, preventing costly damage.
- • **Smart Water Level Monitoring:** Track presence and receding water levels remotely for versatile uses—from sump pumps to pet care watering systems.
- • **Unmatched Long-Range Coverage:** Industry-leading 1,320 feet wireless range keeps you connected even in hard-to-reach spots like basements and outbuildings.
- • **Effortless Setup & Versatility:** Compact, battery-powered design installs in minutes anywhere water risk exists—under sinks, near appliances, or in remote sheds.
- • **Seamless Smart Home Integration:** Works effortlessly with Alexa and IFTTT via YoLink Hub, enabling advanced automations tailored to your lifestyle.

## Overview

The YoLink Water Leak Sensor 2 offers unparalleled 1/4 mile wireless range using LoRa technology, a powerful 105dB built-in siren, and smart water level monitoring. Designed for indoor use, it integrates with Alexa and IFTTT through the YoLink Hub (sold separately) to deliver instant alerts and automation. Powered by 2 included AAA batteries, it’s ideal for protecting homes, rental properties, and remote buildings from costly water damage.

## Description

INTRODUCTION:Smart water detector with built-in siren, detects the presence or absence of water, and displays the status on the YoLink appNote: For water detection, only, without an integral siren, consider our original Water Leak SensorREQUIREMENTS:YoLink Hub with internet connection (wired Ethernet or 2.4GHz Wi-Fi). Please search B07TQLKQLJ for the HubSmartphone or tablet running iOS 9 or higher, Android 4.4 or higherTECHNICAL SPECS:Power: 2 AAA batteries (3V DC)Dimension [L x W x D]: 2.44 x 2.44 x 0.80 inches (83.06 x 30.99 x 14.99 mm)Cable Sensor: 4.2 feet (1.2 meters), can be extended to 10 feetOperating Temperature Range: 32°F – 122°F (0°C – 50°C)Operating Humidity Range: ≤95%RH non-condensingIntended for indoor use only APPLICATIONS:Place the YoLink Water Leak Sensor 2 anywhere that is at risk of high moisture or water, due to leaks or floodingUse the YoLink smartphone app to remotely monitor the status of your water leak sensors in your home, rental property, condo, summer home or business (internet connection and YoLink Hub required) YoLink’s industry-leading long range communication allows for placing the sensor in your barns, separate garage building, greenhouse, etc.Some common applications include:Locations at or below grade, subject to water incursionBasement floorsNear sump pumpsUnder sinksNext to toiletsUnder or near laundry machinesUnder dishwashersUnder refrigerators & ice machines Under fish tanks/aquariumsInside hot tubs**Refer to device environmental limitations in Technical Specs, above. Use this device outside the recommended ranges at your own risk; warranty may be voided, etc.PACKAGE CONTENTS:(1) YoLink Water Leak Sensor 2 (batteries included)(1) Cable Sensor(1) Mounting Hook(1) Quick Start Guide PLEASE NOTE:YoLink products work only in the USA and Canada

Review: This is only one of the line of YoLink products that we purchased and all of them are very reliable, easy to operate and recommended! This one I'm using as alert for sump pump. Hi availability, long range coverage and reliability. Various scenarios can be programmed and alarms will be received. Shareable monitoring.
Review: They do not understand a word of English ,I feel I have been transported to a hawkers stall in my home country. I had to call call to get a refund Products are equally unreliable as the people behind it. Quick money

## Features

- Smart Water Leak Detector: Monitor critical locations at risk of flooding, and be informed immediately of the presence of water, preventing costly repairs; Smart Water Level Monitoring: The sensor may be configured for water level monitoring – be informed when water is no longer present or when water levels recede. Monitor water supplies for pet care, house plants, gardening and more.
- World's Longest Wireless Range: Powered by LoRa technology, the long-range yet low-power system offers the industry’s longest receiving range in the market (1/4 mile). Our long-range coverage enables its use in areas challenging for most residential Wi-Fi systems, such as basements, outdoor porch/patio areas, sheds, free-standing garages, even remote outbuildings on your property.
- Early-Warning Notifications: Receive real-time early-warning notifications and protect your home and property from water damage. Notifications are in the form of smartphone banner alerts, limited SMS/text messages and emails, each optional and configured per your needs. Additionally, you may configure your system to activate a siren alarm and/or lights in your home.
- Easy and Effective Property Protection: The YoLink wireless Water Sensor could not be easier to install; just place near or under the equipment you wish to monitor. Suggested uses are near or under sump pumps, toilets, water heaters, laundry machines, dishwashers, sinks, fish tanks and any other location subject to water leaks and flooding.
- From Simple to Super-Smart: After setting up your notification preferences, keep it simple and let the YoLink system do the rest and monitor your home and property for you. Or, utilize available advanced automation features, including 3rd-party integration with Alexa and IFTTT, to interact with other YoLink and 3rd-party smart devices. Limited only by your imagination! (YoLink Hub is required, sold separately; Please search B07TQLKQLJ for the Hub)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08P1WD66X |
| ASIN  | B08P1WD66X |
| Batteries | 2 AAA batteries required. (included) |
| Batteries  | 2 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Battery description | 2 AAA batteries |
| Best Sellers Rank | #108,423 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #350 in Safety Sensors & Detectors |
| Color | Without Hub |
| Control method | App |
| Customer Reviews | 4.5 4.5 out of 5 stars (416) |
| Customer reviews | 4.5 4.5 out of 5 stars (416) |
| Date First Available | 3 April 2021 |
| Date First Available  | 3 April 2021 |
| Item Package Quantity | 1 |
| Item Weight | 90 g |
| Item model number | YS7904-UC |
| Item model number  | YS7904-UC |
| Manufacturer | YOSMART |
| Manufacturer  | YOSMART |
| Maximum range | 1320 Feet |
| Mounting type | Tabletop Mount |
| Noise level | 105 Decibels |
| Number of batteries | 2 AAA batteries required. (included) |
| Part number | YS7904-UC |
| Product Dimensions | 8.31 x 1.5 x 3.1 cm; 90 g |
| Product Dimensions  | 8.31 x 1.5 x 3.1 cm; 90 g |
| Sensor technology | Rope Sensor |
| Style | Water Leak Sensor 2 |
| Switch Style | Temperature Switch |
| UPC | 850024791091 |
| Voltage | 3 Volts |
| tech_spec_battery_description_toys | 2 AAA batteries |

## Product Details

- **Brand:** YoLink
- **Colour:** Without Hub
- **Compatible devices:** Smartphone, Tablet
- **Power source:** Battery Powered
- **Product dimensions:** 6.2L x 6.2W x 2H centimeters

## Images

![Water Leak Sensor 2,1/4 Mile World'S Longest Range Smart Home Sensor,Water Detector With Built-In Siren Up To 105Db,Works Alexa And Ifttt-Yolink Hub Required,Ys7904-Uc - Image 1](https://m.media-amazon.com/images/I/51xkkGlZDWL.jpg)

## 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

### ⭐⭐⭐⭐⭐ Review
*by Y***V on 14 December 2024*

This is only one of the line of YoLink products that we purchased and all of them are very reliable, easy to operate and recommended! This one I'm using as alert for sump pump. Hi availability, long range coverage and reliability. Various scenarios can be programmed and alarms will be received. Shareable monitoring.

### ⭐ Review
*by N***T on 22 October 2024*

They do not understand a word of English ,I feel I have been transported to a hawkers stall in my home country. I had to call call to get a refund Products are equally unreliable as the people behind it. Quick money

### ⭐⭐⭐⭐⭐ Review
*by H***R on 3 December 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.

## 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 Spain*
*Store origin: ES*
*Last updated: 2026-02-14*