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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, Compatible with Alexa and IFTTT - YoLink Hub Required

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, Compatible with Alexa and IFTTT - YoLink Hub Required

Q: 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

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?

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?

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?

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

Product ID: 417266342

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Details

Colour
Water Leak 2
Brand
YoLink
Power source
Battery
Compatible devices
Smartphone
Product dimensions
6.2L x 6.2W x

📱Real-time app alerts

📶1/4 mile LoRa range

🔔105dB built-in siren

Description

💧 Stay dry, stay ahead — the ultimate water leak guardian for your smart home!

INSTANT FLOOD ALERTS - Receive real-time smartphone notifications plus optional siren alarms to stop water damage before it starts.
SMART WATER LEVEL MONITORING - Track presence and receding water levels remotely—ideal for pet care, gardening, and home safety.
UNMATCHED LONG RANGE COVERAGE - Industry-leading 1,320 feet wireless range powered by LoRa tech—perfect for basements, garages, and remote outbuildings.
EFFORTLESS SETUP VERSATILITY - Plug-and-play installation with a 4.2 ft sensor cable (extendable to 10 ft) fits under sinks, sump pumps, dishwashers, and more.
SEAMLESS SMART HOME INTEGRATION - Works with Alexa and IFTTT for custom automations—turn your home into a proactive water damage fortress.

The YoLink Water Leak Sensor 2 is a cutting-edge smart home device featuring the world's longest wireless range of 1/4 mile via LoRa technology, a powerful 105dB built-in siren, and real-time app notifications. Designed for indoor use, it monitors water presence and levels with a flexible sensor cable, integrates with Alexa and IFTTT, and requires the YoLink Hub for operation. Ideal for protecting homes, rental properties, and remote buildings from costly water damage.

Specifications

Battery description	2 AAA batteries
Number of batteries	2 AAA batteries required. (included)
Voltage	3 Volts
Control method	App
Noise level	105 dB
Mounting type	Wall Mount
Maximum range	1.32E+3 Feet
Sensor technology	Rope Sensor
UPC	850024791091
Manufacturer	YOSMART
Part Number	YS7904-UC
Product Dimensions	8.31 x 1.5 x 3.1 cm; 90 g
Batteries	2 AAA batteries required. (included)
Item model number	YS7904-UC
Style	Water Leak Sensor 2
Material	Plastic
Item Package Quantity	1
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Weight	90 g

Have a Question? See What Others Asked

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

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

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?

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

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