Does the entire cable detect water or just the tip on the end?

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

I plan to submerge v3 type of the sensor in the sump pump. I wonder if the "dirty" water will corrode/damage the sensor?

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

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?

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

Will laying this cable on a conducting metal surface trigger the alarm? I.e. inside a water heater pan?

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

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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

Product ID: 304912617

Details

Brand
YoLink
Item dimensions L x W x H
8.3 x 1.5 x
Lower temperature rating
32 Degrees
Measuring range
32 - 122 °F
Style
Water Leak 2

📡1/4 mile LoRa range

📱Real-time smartphone alerts

🔔105dB built-in siren

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Description

💧 Stay dry, stay ahead—never miss a leak with the world’s longest-range water sensor!

INSTANT FLOOD ALERTS - Receive real-time notifications via app, SMS, or email to stop water damage before it starts.
POWERFUL BUILT IN SIREN - 105dB siren ensures immediate on-site awareness, even if you’re away.
UNMATCHED LONG RANGE COVERAGE - Industry-leading 1/4 mile wireless range powered by LoRa tech—perfect for basements, garages, and remote outbuildings.
SEAMLESS SMART HOME INTEGRATION - Works effortlessly with Alexa and IFTTT for next-level automation and control (YoLink Hub required).
EFFORTLESS SETUP VERSATILE PLACEMENT - Compact, battery-powered design installs in minutes near sump pumps, dishwashers, or fish tanks—protect every vulnerable spot.

The YoLink Water Leak Sensor 2 offers the longest wireless range in the market at 1/4 mile using LoRa technology, combined with a loud 105dB built-in siren and real-time smartphone alerts. Designed for indoor use, it monitors water presence or absence in critical areas prone to leaks or flooding. Compatible with Alexa and IFTTT (YoLink Hub required), it provides smart home integration and early-warning notifications to prevent costly water damage. Powered by 2 AAA batteries and easy to install, it’s ideal for basements, garages, laundry rooms, and remote outbuildings.

Specifications

ASIN	B08P1WD66X
ASIN	B08P1WD66X
Batteries	2 AAA batteries required. (included)
Best Sellers Rank	#67,288 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #197 in Safety Sensors & Detectors
Brand Name	YoLink
Customer Reviews	4.5 4.5 out of 5 stars (442)
Customer reviews	4.5 4.5 out of 5 stars (442)
Date First Available	3 April 2021
Item Dimensions	8.3 x 1.5 x 3.1 centimeters
Item model number	YS7904-UC
Lower Temperature Rating	32 Degrees Fahrenheit
Manufacturer	YOSMART
Manufacturer	YOSMART
Measuring Range	32 - 122 °F
Model	YS7904-UC
Mounting Type	Tabletop Mount
Part Number	YS7904-UC
Product Dimensions	8.31 x 1.5 x 3.1 cm; 100 g
Sensing Distance	0.25 Miles
Smart Home Compatibility	Smart Home Compatible
Specific Uses For Product	water leak detection, basement, outdoor, remote outbuildings, sump pumps, sinks, toilets, laundry machines, dishwashers
Style Name	Water Leak Sensor 2
UPC	850024791091
Upper Temperature Rating	122 Degrees Fahrenheit

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25878 Ft

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In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

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