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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Description

💧 Leak-proof your home with the longest reach and smartest alerts!

RELIABLE POWER THAT LASTS - Enjoy over 2 years of uninterrupted protection with included AAA batteries.
UNMATCHED LONG RANGE COVERAGE - Stay connected with the world’s longest 1/4 mile LoRa wireless range—no WiFi needed.
EFFORTLESS SETUP INTEGRATION - Scan & Play QR-code app setup plus Alexa & IFTTT compatibility for seamless smart home control.
FAILSAFE DEVICE TO DEVICE PAIRING - Patented Control-D2D tech keeps sensors operational during power or internet outages.
INSTANT ALERTS WITH EAR PIERCING SIREN - Built-in 105dB siren ensures you never miss a leak, even when away.

The YoLink Water Leak Sensor 2 offers industry-leading 1/4 mile LoRa wireless range and a powerful 105dB siren to detect leaks early. With over 2 years of battery life and patented device-to-device pairing, it guarantees reliable operation even without WiFi or power. Easy QR-code setup and Alexa/IFTTT compatibility make it a must-have for proactive smart home water protection.

Specifications

Battery Description	Not Specified
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
Item Weight	3.17 ounces
Product Dimensions	3.27 x 0.59 x 1.22 inches
Item model number	YS7904-UC
Batteries	2 AAA batteries required. (included)
Style	Without Hub
Material	Plastic
Item Package Quantity	1
Coverage	1000 Feet(Open Air)
Switch Style	Temperature Switch
Usage	Amateur, Inside, Professional
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Description Pile	Not Specified
Warranty Description	2 Years

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