---
product_id: 527896895
title: "YoLink Water Level Sensor with Float Switch, 105 dB, YS7904F"
brand: "yolink"
price: "NZ$93"
currency: NZD
in_stock: true
reviews_count: 13
category: "Yo Link"
url: https://www.desertcart.nz/products/527896895-yolink-water-level-sensor-with-float-switch-105-db-ys7904f
store_origin: NZ
region: New Zealand
---

# LoRa wireless up to 1/4 mile 105dB built-in siren alarm 2 AA batteries, 1-2 years life YoLink Water Level Sensor with Float Switch, 105 dB, YS7904F

**Brand:** yolink
**Price:** NZ$93
**Availability:** ✅ In Stock

## Summary

> 💧 Stay dry, stay connected — the future of water level monitoring is wireless and worry-free!

## Quick Answers

- **What is this?** YoLink Water Level Sensor with Float Switch, 105 dB, YS7904F by yolink
- **How much does it cost?** NZ$93 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/527896895-yolink-water-level-sensor-with-float-switch-105-db-ys7904f)

## 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

- • **Loud & Local Alarm:** Built-in 105dB siren ensures immediate on-site alerts, complemented by optional remote sirens for full coverage.
- • **Smart Alerts Anywhere:** Get instant push, email, SMS, or Alexa notifications so you never miss a leak or overflow, no matter where you are.
- • **DIY Pendant Float Switch:** Easy to install with stainless steel ballast for stable, wave-resistant water level detection—no electrician needed.
- • **Seamless Home Automation:** Integrates with YoLink ecosystem, Alexa, IFTTT, and Home Assistant for automated pump control and alarm activation.
- • **Ultra-Long Range Wireless:** LoRa tech delivers up to 1320 feet of reliable, cable-free monitoring—perfect for hard-to-reach spots.

## Overview

The YoLink LoRa Smart Water Level Monitoring Sensor is a wireless, battery-powered float switch alarm designed for versatile water level detection in sump pumps, tanks, toilets, and more. Utilizing long-range LoRa technology, it offers up to 1/4 mile connectivity without WiFi or wiring. Featuring a 105dB siren and smart app notifications (push, email, SMS, Alexa), it integrates seamlessly with the YoLink ecosystem for automated water management and peace of mind. Easy DIY installation and 1-2 year battery life make it a reliable, professional-grade solution for proactive water monitoring.

## Description

desertcart.com: YoLink LoRa Smart Water Level Monitoring Sensor, Wireless Battery-Powered Float Switch Alarm, Sump Pump Alarm, AC Condensate Overflow, Tank Level, Toilet Leak Sensor, 105dB Siren, YoLink Hub Required : Industrial & Scientific

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

- MANY APPLICATIONS! Sump pump alarm, AC condensate pan overflow alarm, runaway toilet/jammed flapper, internal toilet leak alarm, fish tank, pond, fountain, rainwater drum/tank, cistern, water storage tank high or low level detector
- SPEND LESS, GET MORE! YoLink smart sensors are not only economical but they are part of a growing family of products compatible with your Water Level Monitoring Sensor. Shut off or turn on water on high or low level detection, turn pumps on/off, activate sirens and lights. Automatically.
- WIRE LESS! The sensor is wireless and battery-powered, with LoRa-based extreme long-range wireless (up to a 1/4 mile open-air!), so you can put your sensor where WiFi and older RF technologies can't go. No cables, conduit, raceway, trenching, or electrician required!
- EASY DIY INSTALLATION with our innovative pendant-mount style float switch. Simply hang or suspend the float switch into the monitoring tank or container. The float switch's stainless steel washers provide ballast for stability against wave action, and also provide edge/sidewall protection. Tie wraps and tie wrap mount included.
- KNOW NOW! This is a smart device with a full-featured app. Beware of products that require you be in earshot of the alarm. Types of notifications available to you include: app push notifications, email, SMS, siren or lighting activation, SpeakerHub sound or spoken messages. Each account receives 5 SMS per month per device, plus 5, free. YoLink Siren, Switch, Plug, Relay or SpeakerHub purchased separately.
- ALARMING! The sensor has a built-in 105dB sounder, for local, indoor alarms. Or, add an optional remote Siren Alarm or other YoLink alarm product. Search B0887SMPKK for the Siren Alarm.
- Looking for water depth monitoring? Our new Water Depth Sensor includes a water pressure sensor probe, capable of measuring water depths up to 16 feet (data reported in centimeters deep). Search B0C5QX3HHQ. Looking for the original Water Level Monitoring Sensor with probe? See the Water Leak Sensor 3, for applications not practical for a float switch, such as for washing machine water drain pipe backup detection. Search B08T8X4XWN
- Looking for the optional ruggedized wall-mount bracket? The optional bracket provides the sensor with additional protection against impact, casual tampering and cord removal. Search B0C4PFTFM2
- Compatible with Alexa, IFTTT and Home Assistant.
- YoLink Hub is REQUIRED! This device will not operate without one of our hubs, not included. We recommend SpeakerHub, our talking, custom tone & sound, hub. Please search B09FSS95G9 for the SpeakerHub, or B07TQLKQLJ for the original Hub.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C3KXCY8B |
| Audible Noise | 105 db |
| Battery Description | AA |
| Best Sellers Rank | #8,725 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #12 in Water Detectors & Alarms |
| Brand | YoLink |
| Built-In Media | Detector |
| Color | Water Leak Sensor 2 |
| Compatible Devices | Android Phone, iPhone |
| Control Method | App |
| Customer Reviews | 4.5 out of 5 stars 942 Reviews |
| Item Dimensions L x W x H | 2.44"L x 2.44"W x 0.8"H |
| Item Type Name | Water Level Sensor |
| Manufacturer | YOSMART |
| Manufacturer Warranty Description | 2 Years |
| Maximum Range | 1320 feet |
| Mfr Part Number | YS7904-UC |
| Model Number | YS7904 |
| Mounting Type | Wall Mount |
| Number of Batteries | 2 AAA batteries required. (included) |
| Number of Items | 1 |
| Power Source | Battery Powered |
| Product Dimensions | 2.44"L x 2.44"W x 0.8"H |
| Sensor Technology | Sound Sensor |
| UPC | 810121540848 810121540565 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** YoLink
- **Color:** Water Leak Sensor 2
- **Compatible Devices:** Android Phone, iPhone
- **Power Source:** Battery Powered
- **Product Dimensions:** 2.44"L x 2.44"W x 0.8"H

## Images

![YoLink Water Level Sensor with Float Switch, 105 dB, YS7904F - Image 1](https://m.media-amazon.com/images/I/51UgTj08bNL.jpg)

## Available Options

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

## 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.

### ⭐⭐⭐⭐⭐ May or may not perform depending on our application.
*by P***B on September 26, 2024*

First, it’s important to know this is just the same “Water Sensor 2” sensor as YoLink’s rope-style water leak sensor and their remote cable style water leak sensor. During setup, it gets configured as their remote cable sensor, but the alerts are simply inverted, so that it alerts when “dry” rather than “wet”. Where this is important is in how the sensor communicates and behaves. Because the sensor is, at its core, a leak sensor, it tends to get very chatty if the body of water you are monitoring for level with this sensor has any chop, as in, say, a swimming pool (even one that’s not actively in use.) I didn’t mind this, as I turned off the alerts and was simply intending to use this with a Home Assistant automation to selectively trigger and stop an auto-pool-refill function. However, it seems like this extreme chattiness may be having other adverse consequences in how the device interacts with YoLink’s platform. I don’t have confirmation yet, but I suspect my device’s updates are being rate-limited by the upstream servers. This unfortunately results in the sensor becoming “stuck” in either the wet or dry reading, regardless of what the sensor’s float switch position actually is. And when the rate limiting (or whatever the problem is) finally resolves, if the float switch doesn’t again cross over the trigger point, the sensor will remain in whatever erroneous position. This has caused me to overfill my pool a couple times as I did not realize the issue was occurring. So, if you have a glass-smooth water surface, such as in a closed reservoir or a small indoor aquarium, where the float switch is reliably either on or off, this may work for you. But for anything where the sensor may tend to cross back and forth over the trigger point cintinuously, such as with any sort of automations, this may not be the best solution. I am currently in the process of working with YoLink support on the issues I’m having, and I will update this review with the results. To their credit, they are extremely helpful. Already they have sent me a replacement sensor to see if that would correct the issue (but it did not). I am now awaiting their next response after giving them detailed feedback. Update: within a week of my previous review, YoLink support informed me of a new updated firmware they had available that would allow a delayed reporting interval for water level alerts. In the computer programming world, you might call this a “debounce” capability. With this firmware update, I can specify how long the sensor must continuously register a water exhausted warning internally before reporting it in an upstream alert to the servers. After applying this update, and some back and forth with support regarding some behaviors that still seemed to not be quite right, I can now say it seems that the sensor is performing as intended for my needs in monitoring the water level in my outdoor swimming pool. I am of course still closely monitoring it to make sure it doesn’t overfill my pool again, but I am cautiously optimistic that YoLink has, with this update, corrected the issue I was having. I am really impressed with Yolink’s responsiveness and willingness to help me find solutions here. I don’t know if the minor firmware update they made available is something they had in the works already, or something they added at my request, as it was very much aligned to a suggestion I made that might alleviate the issue. Either way, it was rolled out seemingly in response to my troubles in a very short order. Kudos to them! I am raising my review rating to five stars (previously 3 stars) for now. Assuming the sensor continues to perform as it is now, the 5 star rating will be deserved. If not, I will return again with an update.

## Frequently Bought Together

- YoLink LoRa Smart Water Level Monitoring Sensor, Wireless Battery-Powered Float Switch Alarm, Sump Pump Alarm, AC Condensate Overflow, Tank Level, Toilet Leak Sensor, 105dB Siren, YoLink Hub Required
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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-09-23*