Is there any way to use the water leak sensor without buying an hub? I have Amazon Echo, would that work?

Sorry, no. YoLink Hub is required to set up YoLink Smart Water Leak Sensor. You can order YoLink Smart Hub from the link https://www.amazon.com/dp/B07TQLKQLJ or you can order our Smart Home Security Start kit which includes this Smart Leak Sensor, Link: https://www.amazon.com/dp/B07V246GCX

Is there an audible water leak alarm without using the app? Onboard alarm?

1. For the waterproof function of the product, we do not have a sound function for YoLink Smart Water Leak Sensor; 2. We will release a YoLink Siren soon which can connect multiple YoLink water leak sensors and other YoLink safety devices, with long distance coverage and alarm even without network connection; 3. Because of the long coverage distance of YoLink products, even if there is sound in the sensors, we still can't hear it, Alerting user's Smart Phone is more important. What's more, our YoLink Siren is even more comprehensive. 4. Reduce its own sound function, which can be waterproof and lower power consumption. The battery life of YoLink Water Leak Sensor can last for more than 5 years.

can I use to turned a switched off if it detects a tank reached a level of water?

You will need a yolink outlet or a yolink wifi togle switch ( depending on the device you are wanting it to turn off ) to link the water sensor together. Then set an "if" scenario and you should be good to go.

why is there such a stark difference in battery life between water sensor 1 vs 2? version 1 is up to 5 years while version 2 only up to 2 years

Water Leak Sensor 2 has a sounder. You can optionally turn off the sounder, but since that draws current from the batteries, it is factored into the battery calculations we used. We tend to lean towards the more worse-case scenario (more frequent use, with sounder enabled) but your experience with it will vary and it could very well be closer to 4 years than 2. Eric with YoSmart

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Description

🚨 Stay dry, stay ahead—leak detection that never sleeps!

SMART ALERTS HISTORY LOGS - Receive instant app notifications and review detailed leak history for proactive home management.
ULTRA LOW MAINTENANCE POWER - Includes 2 AAA alkaline batteries with over 5 years of life—stay protected without constant replacements.
WI FI INTERNET INDEPENDENT - Operates flawlessly without WiFi or internet, ensuring alerts even during outages or power loss.
UNMATCHED LONG RANGE COVERAGE - LoRa tech delivers up to 1,320 feet open-air range—perfect for basements, garages, and remote outbuildings.
SET IT FORGET IT INSTALLATION - Surface-mount sensor installs in seconds—no wiring, no hassle, just reliable leak detection.

The YoLink Wireless Leak Sensor uses industrial-grade LoRa technology to provide an unparalleled ¼ mile wireless range without relying on WiFi or internet. Designed for easy surface mounting, it delivers instant leak alerts via app notifications and maintains encrypted device-to-device communication for maximum security. Powered by included AAA batteries lasting over 5 years, this sensor ensures continuous, low-maintenance protection for your home or business, even in challenging locations like basements or remote outbuildings. Note: YoLink Hub required for full functionality.

Specifications

Battery description	Alkaline
Number of batteries	2 AAA batteries required. (included)
Voltage	3 Volts
Control method	App, Voice
Mounting type	Protruding
Maximum range	4E+2 Meters
Sensor technology	LoRa
UPC	850024791480 750258361438
Manufacturer	YoLink
Part number	YS7903
Item Weight	80 g
Product Dimensions	6.1 x 6.1 x 2.2 cm; 80 g
Batteries	2 AAA batteries required. (included)
Item model number	YS7903
Color	White
Style	1-Sensor without Hub
Material	Plastic
Installation Method	Surface-Mounted
Item Package Quantity	1
Temperature Range	32-122 Degrees Fahrenheit
Speed Rating	long range smart home automation
Coverage	1000 Feet (Open Air)
Switch Style	Temperature Switch
Special Features	Easy to Install
Specific uses	Amateur, Inside, Professional, indoor use only
Included components	Detector
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
tech_spec_battery_description_toys	Alkaline

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