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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💧 Stay dry, stay smart—never miss a leak again!

INSTANT FLOOD ALERTS - Receive real-time smartphone notifications plus a piercing 105dB siren to stop water damage before it starts.
PLUG PROTECT SIMPLICITY - Easy setup with included mounting hook and cable sensor—start safeguarding your home in minutes.
EFFORTLESS SMART INTEGRATION - Seamlessly connects with Alexa and IFTTT for next-level home automation and peace of mind.
UNMATCHED LONG RANGE COVERAGE - Industry-leading 1/4 mile wireless range powered by LoRa tech—perfect for basements, garages, and remote outbuildings.
VERSATILE WATER LEVEL MONITORING - Track presence and receding water levels to protect everything from sump pumps to pet water supplies.

The YoLink Water Leak Sensor 2 offers the world’s longest wireless range at 1/4 mile using LoRa technology, combined with a powerful 105dB built-in siren for immediate alerts. Compatible with Alexa and IFTTT, it provides versatile water presence and level monitoring to protect your home, outbuildings, and valuables from costly water damage. Powered by 2 included AAA batteries and requiring the YoLink Hub, this sensor delivers effortless installation and smart home integration for proactive flood prevention.

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Battery description	2 AAA batteries
Number of batteries	2 AAA batteries required. (included)
Voltage	3 Volts
Control method	App
Noise level	105 Decibels
Maximum range	1.32E+3 Feet
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

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

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