---
product_id: 172493031
title: "Water Leak Sensor 1, YS7903"
brand: "yolink"
price: "¥5595"
currency: JPY
in_stock: true
category: "Yo Link"
url: https://www.desertcart.jp/products/172493031-water-leak-sensor-1-ys7903
store_origin: JP
region: Japan
---

# ¼ mile LoRa range 5+ years battery life Encrypted device-to-device Water Leak Sensor 1, YS7903

**Brand:** yolink
**Price:** ¥5595
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay leak-proof anywhere—because your smart home deserves the longest reach!

## Quick Answers

- **What is this?** Water Leak Sensor 1, YS7903 by yolink
- **How much does it cost?** ¥5595 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/172493031-water-leak-sensor-1-ys7903)

## 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

- • **Smart Home Ready:** Seamlessly integrates with Alexa, IFTTT, and YoLink Hub for total control.
- • **Set It & Forget It:** Instant install—just place near vulnerable spots and relax.
- • **5+ Years Battery Life:** Long-lasting AAA batteries included for years of uninterrupted protection.
- • **Unmatched ¼ Mile Range:** Industry-leading LoRa tech cuts through walls & WiFi dead zones effortlessly.
- • **WiFi & Internet Independent:** Operates flawlessly even when your network or power fails.

## Overview

The YoLink Water Leak Detector leverages industrial-grade LoRa technology to deliver the longest wireless range in the market—up to ¼ mile in open air—ensuring reliable water leak detection even in WiFi-challenged areas like basements and outbuildings. With encrypted device-to-device communication, it operates independently of WiFi, internet, or power outages. Easy to install and powered by replaceable AAA batteries lasting over 5 years, it integrates smoothly with Alexa, IFTTT, and the YoLink Hub, making it a must-have for proactive, tech-savvy homeowners and managers.

## Description

YoLink Water Leak Detector, 1/4 Mile World's Longest Range, Wireless Smart Water Leak Sensor, Alexa, IFTTT, Hub Required: desertcart.com: Industrial & Scientific

## Features

- NO WiFi WORRIES! YoLink devices communicate by LoRa, an industrial-grade protocol that provides up to ¼ mile open air range. Devices do NOT connect to your network or even to the internet; they communicate with the Hub (Not included!). Long range, obstruction penetration, no reliance on WiFi, and fully-encrypted communications provide more than most ask for from their smart home system!
- SET IT & FORGET IT! Installs in seconds! 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, toilets, water heaters, laundry machines, dishwashers, sinks, fish tanks, in or near sump pumps, and by any other location subject to water leaks and flooding.
- EXTREME LONG 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.
- 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!
- START SMART! A YoLink hub is required for full functionality, including for the app to work, to check battery level, etc, but your hub is compatible with a growing family of smart products for home and business! Search for B0BZBYD1MK or B09FSS95G9 for a SpeakerHub (our audio, talking hub) or B08CBTTD17 or B07TQLKQLJ for the original Hub.
- BATTERIES INCLUDED! Two replaceable AAA batteries, good for over 5 years, are included!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Z7QWJBP |
| Best Sellers Rank | #2,378 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Water Detectors & Alarms |
| Brand Name | YoLink |
| Current Rating | 3 microamps |
| Customer Reviews | 4.6 4.6 out of 5 stars (6,879) |
| Included Components | Valve Controller |
| Item Dimensions | 2.44 x 2.44 x 0.96 inches |
| Item Type Name | Water Leak Sensor |
| Item Weight | 0.08 kg |
| Manufacturer | YoSmart |
| Material Type | Plastic |
| Model | YS1603+YS5001+YS5004+4YS7903 |
| Mounting Type | Protruding |
| Number of Items | 1 |
| Part Number | YS7903 |
| Specific Uses For Product | Amateur, Inside, Professional, indoor use only |
| Style Name | 0dB, without hub |
| UPC | 850024791480 750258361438 |
| Unit Count | 1 Count |
| Warranty Description | 2 Years |

## Product Details

- **Brand:** YoLink
- **Item Weight:** 0.08 kg
- **Item dimensions L x W x H:** 2.44 x 2.44 x 0.96 inches
- **Material:** Plastic
- **Style:** 0dB, without hub

## Images

![Water Leak Sensor 1, YS7903 - Image 1](https://m.media-amazon.com/images/I/51LUzFXo-yL.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Questions & Answers

**Q: Is there any way to use the water leak sensor without buying an hub? I have Amazon Echo, would that work?**
A: Sorry, no. YoLink Hub is required to set up YoLink Smart Water Leak Sensor. 
You can order YoLink Smart Hub from the link https://www.amazon.com/dp/B07TQLKQLJ 
or you can order our Smart Home Security Start kit which includes this Smart Leak Sensor, Link: https://www.amazon.com/dp/B07V246GCX

**Q: Is there an audible water leak alarm without using the app? Onboard alarm?**
A: 1. For the waterproof function of the product, we do not have a sound function for YoLink Smart Water Leak Sensor;
2. We will release a YoLink Siren soon which can connect multiple YoLink water leak sensors and other YoLink safety devices,  with long distance coverage and alarm even without network connection;
3. Because of the long coverage distance of YoLink products, even if there is sound in the sensors, we still can't hear it, Alerting user's Smart Phone is more important. What's more, our YoLink Siren is even more comprehensive.
4. Reduce its own sound function, which can be waterproof and lower power consumption. The battery life of YoLink Water Leak Sensor can last for more than 5 years.

**Q: can I use to turned a switched off if it detects a tank reached a level of water?**
A: You will need a yolink outlet or a yolink wifi togle switch ( depending on the device you are wanting it to turn off ) to link the water sensor together. Then set an "if" scenario and you should be good to go.

**Q: why is there such a stark difference in battery life between water sensor 1 vs 2? version 1 is up to 5 years while version 2 only up to 2 years**
A: Water Leak Sensor 2 has a sounder. You can optionally turn off the sounder, but since that draws current from the batteries, it is factored into the battery calculations we used.  We tend to lean towards the more worse-case scenario (more frequent use, with sounder enabled) but your experience with it will vary and it could very well be closer  to 4 years than 2. 

Eric with YoSmart

## Frequently Bought Together

- YoLink Water Leak Detector, 1/4 Mile World's Longest Range, Wireless Smart Water Leak Sensor, Alexa, IFTTT, Hub Required
- YoLink Smart Wireless Temperature & Humidity Sensor, Wide Temp Range for Fridge, Green House, Pet Cage, App Alerts, Emails, Text/SMS alerts- Hub Required
- YoLink Smart Home Starter Kit: Hub & Water Leak Sensor 4-Pack, SMS/Text, Email & Push Notifications, LoRa Up to 1/4 Mile Open-Air Range, w/Alexa, IFTTT, Home Assistant

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**Shop now:** [https://www.desertcart.jp/products/172493031-water-leak-sensor-1-ys7903](https://www.desertcart.jp/products/172493031-water-leak-sensor-1-ys7903)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-20*