Can you replace the batteries?

Yes, there are rubber tips on the 4 corners of the bottom, you can remove them and unscrew 4 screws and open the sensor, to replace two AAA batteries. The battery can run more than 5 years. You can search on YouTube video of how to change the YoLink water sensor's battery and can find the videos. Thanks!

Is this a dumb proprietary system or does it ingrate with smart home technologies, ie Z-wave Zigbee etc?

It is not Zigbee, WiFi or Z-Wave wireless technologies, all these wireless technologies only work for short range. The YoLink system use the longest wireless range and lower power consumption. It works with the YoLink hub and can be integrate to other system through the Alexa routines, IFTTT or YoLink's API. Thanks!

Do you have any water leak sensors that have audio as well as the app reminder? Or are these just app reminders?

These 3 pack leak sensors don't have build in audio sound. We have YoLink water leak sensor 2 which has build in sound, both them have app push notifications, emails and text message for leak alert.

What frimware version do you have on these D or E? Tx

Mine came with 030E installed. The sensors I bought previously had 030D installed and still aren't being offered the 030E update even though they are the exact same model number. I also don't know the difference between 030D and 030E as they don't seem to publish any firmware changelog that I can find.

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💧 Stay leak-proof, even when WiFi drops—smart sensing that never quits!

RELIABLE OFFLINE OPERATION - Patented Control-D2D pairing keeps sensors active even if WiFi, internet, or power fail.
ULTRA LOW MAINTENANCE POWER - Includes 2 AAA batteries per sensor lasting over 5 years—no frequent replacements needed.
UNMATCHED LONG RANGE COVERAGE - LoRa tech delivers up to 1,320 feet range—perfect for basements, garages, and remote spots beyond WiFi reach.
SEAMLESS SMART HOME INTEGRATION - Works with Alexa, IFTTT, and YoLink Hub for real-time alerts and smart automation.
SET IT FORGET IT INSTALLATION - Instant setup with no wiring—just place near vulnerable water sources and relax.

The YoLink 3 Pack Smart Water Leak Sensor uses advanced LoRa wireless technology to provide industry-leading ¼ mile range and robust wall penetration without relying on WiFi or internet. Designed for effortless installation near water-prone areas, it features encrypted device-to-device communication ensuring uninterrupted operation during outages. Compatible with Alexa, IFTTT, and the YoLink Hub, it offers smart notifications and automation. Each sensor runs on included AAA batteries lasting over 5 years, making it a low-maintenance, reliable solution for proactive water leak detection in any home or business setting.

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Battery description	Alkaline
Number of batteries	6 AAA batteries required.
Voltage	3 Volts
Control method	App
Mounting type	Tabletop Mount
Maximum range	1.32E+3 Feet
Sensor technology	Water Leak Sensor Technology
UPC	750258361643
Manufacturer	YoSmart
Part Number	YS7903-UC*3
Product Dimensions	6.4 x 6.4 x 2.5 cm; 249 g
Batteries	6 AAA batteries required.
Item model number	YS7903
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Battery Cell Type	Alkaline
Item Weight	249 g

YoLink 3 Pack Smart Water Leak Sensor, 1/4 Mile Range, Alexa & IFTTT Compatible, App Notifications - Hub Required (YS7903-UCx3)

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