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

💧 Stay dry, stay smart — the longest-range water leak sensor that’s always one step ahead!

INSTANT FLOOD ALERTS - Receive real-time notifications on your phone to stop water damage before it starts 📱
POWERFUL SIREN PROTECTION - 105dB built-in siren instantly warns you and deters damage 🔔
SIMPLE SETUP MAXIMUM PEACE - Easy install near vulnerable spots—sump pumps, water heaters, and more 🛠️
EFFORTLESS SMART INTEGRATION - Seamlessly works with Alexa and IFTTT for next-level home automation 🤖
UNMATCHED LONG RANGE COVERAGE - Industry-leading 1,320 ft wireless range beats Wi-Fi dead zones 📡

The YoLink Water Leak Sensor 2 offers the world’s longest wireless range at 1,320 feet using LoRa technology, ensuring reliable monitoring even in Wi-Fi dead zones like basements and outbuildings. Featuring a powerful 105dB siren and real-time smartphone alerts, it provides instant flood warnings to protect your home. Compatible with Alexa and IFTTT, it integrates effortlessly into your smart home ecosystem. Powered by 2 included AAA batteries, this compact sensor installs easily near any water-risk area for proactive, hassle-free protection.

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
Item Weight	90 g
Product Dimensions	8.31 x 1.5 x 3.1 cm; 90 g
Batteries	2 AAA batteries required. (included)
Item model number	YS7904-UC
Color	Without Hub
Style	Water Leak Sensor 2
Item Package Quantity	1
Switch Style	Temperature Switch
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
tech_spec_battery_description_toys	2 AAA batteries

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