Compiled by SmartHomeWorkflow Research · YoLink · Water Protection & Plumbing · ~$19.99 (at time of research — $19.99 read from YoLink's own storefront structured data (SKU YS7906, in stock) on 2026-08-17. ⚠ The real cost of a first YoLink sensor is higher than this line, because nothing in the brand works without a hub: budget the YoLink Hub (~$23.59–$29.99) alongside it, which is the same bridge-pricing rule this catalogue applies to THIRDREALITY. Never treated as a live price.)
⚠ Similar names, different products: YoLink sells at least four numbered leak sensors at once and the numbers are model generations, not capability tiers you can rank by eye: the Water Leak Sensor 1 (YS7903) and Water Leak Sensor 2 (YS7904) are still on the storefront beside this one. A 'Water Leak Sensor 4 MoveAlert' variant also exists, which adds removal detection and is not this SKU. Check the YS number, not the name.
Choose a platform above for its connection. A hub can be optional for the device itself and required for a platform or automation.
Required for the device
YoLink hub or bridge
Setup and sources
YoLink states it plainly: 'A YoLink Hub or SpeakerHub is required for full app notifications and automation functionality.' ⚠ Read the scope of that sentence carefully rather than as an all-or-nothing — the sensor's own 105 dB sounder is on the device, so a hubless unit still screams in the room where the water is; what the hub buys is knowing about it when you are not standing there. YoLink also documents 'YoLink Control D2D device-to-device pairing', which lets one YoLink device trigger another without internet or WiFi — a second reason the hub dependency is narrower than it first sounds.
Yes — a YoLink Hub (or SpeakerHub) is required, and it is not the usual optional-accessory kind of required. This sensor speaks LoRa and nothing else, so without the hub it cannot reach an app, a phone or any smart-home platform. YoLink's own wording scopes it precisely: the hub is required 'for full app notifications and automation functionality'. Two things survive without one: the 105 dB sounder is on the sensor itself, so it still alarms in the room where the water is, and YoLink's device-to-device pairing lets one YoLink device trigger another with no internet or WiFi. Budget roughly $23.59–$29.99 for the hub on top of this sensor's price.[1]
Apple Home · Doesn't work
This connection does not work
No supported connection
YoLink Water Leak Sensor 4×Apple Home
The record does not support a connection to this platform. Read the explanation below.
No Apple Home path exists, and the reason is architectural rather than a missing integration: this sensor's only route anywhere is the YoLink Hub, whose own compatibility list enumerates Alexa, Google, IFTTT, Home Assistant and Raedius with no Apple Home and no Matter. There is no per-device workaround behind a hub that does not speak Apple.[2][14]
Google Home · Inconclusive
This connection is not confirmed for this model
Connection not confirmed
YoLink Water Leak Sensor 4?Google Home
There is not enough model-specific evidence to draw a supported connection. Read the evidence and limits below.
Not established for this sensor specifically. YoLink's hub page names Google among its platforms, and everything this sensor does reaches the outside world through that hub — but the sensor's own content names Alexa, Home Assistant and IFTTT without naming Google, and this catalogue does not fill a per-product gap from a hub's list. An honest unknown rather than an inherited yes.[1][11][12]
Amazon Alexa · Works per the maker; details unconfirmed
Equipment needed for this connection
Connection setup needs a check
YoLink Water Leak Sensor 4?Amazon Alexa
Compatibility is named, but the connection method is not documented here. A working path cannot be drawn yet.
Needed for this connection
YoLink hub or bridge
Setup and sources
YoLink states it plainly: 'A YoLink Hub or SpeakerHub is required for full app notifications and automation functionality.' ⚠ Read the scope of that sentence carefully rather than as an all-or-nothing — the sensor's own 105 dB sounder is on the device, so a hubless unit still screams in the room where the water is; what the hub buys is knowing about it when you are not standing there. YoLink also documents 'YoLink Control D2D device-to-device pairing', which lets one YoLink device trigger another without internet or WiFi — a second reason the hub dependency is narrower than it first sounds.
YoLink lists Alexa for this sensor. It does not say how the sensor reaches Alexa or what Alexa can do with it, so nothing beyond the name is confirmed.[1]
SmartThings · Doesn't work
This connection does not work
No supported connection
YoLink Water Leak Sensor 4×SmartThings
The record does not support a connection to this platform. Read the explanation below.
Same architectural absence as Apple — SmartThings is not among the platforms YoLink's hub names, and the hub is this sensor's only path off the LoRa network.[2][14]
Home Assistant · Works per the maker; details unconfirmed
How it connects to Home Assistant
Follow the recorded connection below. Equipment details and setup limits explain what else this path needs.
Official integration
The documented connection
YoLink Water Leak Sensor 4
YoLink Water Leak Sensor 4YoLink Water Leak Sensor 4
→Device connection
YoLink hub or bridgeRequired hub or bridge
→Internet
Cloud serviceInternet connection required
→Official integration
Home AssistantPlatform control
What you gainReach the device through the documented cloud connection.
Keep in mindCheck the function table for supported controls and routines. A connection diagram does not establish every function or remote access.
How to read the equipment roles
This shows the connection route, not every network cable or a shopping list. One device may provide several roles, including a Matter controller and a Thread border router. Only a Thread connection needs the Thread role. Read the equipment cards for all recorded requirements.
These paths summarize documented setup options. Check the function table for the connection covered by each recorded capability.
Needed for this connection
YoLink hub or bridge
Setup and sources
YoLink states it plainly: 'A YoLink Hub or SpeakerHub is required for full app notifications and automation functionality.' ⚠ Read the scope of that sentence carefully rather than as an all-or-nothing — the sensor's own 105 dB sounder is on the device, so a hubless unit still screams in the room where the water is; what the hub buys is knowing about it when you are not standing there. YoLink also documents 'YoLink Control D2D device-to-device pairing', which lets one YoLink device trigger another without internet or WiFi — a second reason the hub dependency is narrower than it first sounds.
Home Assistant's own YoLink integration names the Water Leak Sensor 4 (YS7906-UC) among the devices it is tested with, and YoLink lists Home Assistant for this sensor too. It works through your YoLink account over YoLink's cloud, so it stops working when the internet or YoLink's service is down. Neither says whether leak alerts show up in Home Assistant, so leak alerts there are unconfirmed.[1][15][16]
One device can provide more than one role. These are setup requirements, not a shopping list of separate purchases.
What could you do with this?
Put its functions to use.
Research, not hands-on testing
Start with a documented control or event. The selected connection shows what is confirmed for that platform.
↗Reported event
Documented device function
Leak detected
The device reports this event.
Compare its platform availability in the table below.
No Apple Home path exists, and the reason is architectural rather than a missing integration: this sensor's only route anywhere is the YoLink Hub, whose own compatibility list enumerates Alexa, Google, IFTTT, Home Assistant and Raedius with no Apple Home and no Matter. There is no per-device workaround behind a hub that does not speak Apple.
Not established for this sensor specifically. YoLink's hub page names Google among its platforms, and everything this sensor does reaches the outside world through that hub — but the sensor's own content names Alexa, Home Assistant and IFTTT without naming Google, and this catalogue does not fill a per-product gap from a hub's list. An honest unknown rather than an inherited yes.
Maker’s hub or bridge. YoLink states it plainly: 'A YoLink Hub or SpeakerHub is required for full app notifications and automation functionality.' ⚠ Read the scope of that sentence carefully rather than as an all-or-nothing — the sensor's own 105 dB sounder is on the device, so a hubless unit still screams in the room where the water is; what the hub buys is knowing about it when you are not standing there. YoLink also documents 'YoLink Control D2D device-to-device pairing', which lets one YoLink device trigger another without internet or WiFi — a second reason the hub dependency is narrower than it first sounds.
YoLink lists Alexa for this sensor. It does not say how the sensor reaches Alexa or what Alexa can do with it, so nothing beyond the name is confirmed.
Same architectural absence as Apple — SmartThings is not among the platforms YoLink's hub names, and the hub is this sensor's only path off the LoRa network.
Home Assistant · Works per the maker; details unconfirmed
Leak detected
This device reports leak detected.
Event
Not stated
Automation
? Not stated
Setup: Maker’s hub or bridge
Setup and sources
Maker’s hub or bridge. YoLink states it plainly: 'A YoLink Hub or SpeakerHub is required for full app notifications and automation functionality.' ⚠ Read the scope of that sentence carefully rather than as an all-or-nothing — the sensor's own 105 dB sounder is on the device, so a hubless unit still screams in the room where the water is; what the hub buys is knowing about it when you are not standing there. YoLink also documents 'YoLink Control D2D device-to-device pairing', which lets one YoLink device trigger another without internet or WiFi — a second reason the hub dependency is narrower than it first sounds.
Home Assistant's own YoLink integration names the Water Leak Sensor 4 (YS7906-UC) among the devices it is tested with, and YoLink lists Home Assistant for this sensor too. It works through your YoLink account over YoLink's cloud, so it stops working when the internet or YoLink's service is down. Neither says whether leak alerts show up in Home Assistant, so leak alerts there are unconfirmed.
Home AssistantWorks per the maker; details unconfirmed[1][15][16]
Leak detectedReported event
Event
✗Doesn't work
Event
?Inconclusive
Event
?Not stated
Event
✗Doesn't work
Event
?Not stated
Automation availability for this model is not established.
✓ Documented for this connection. × A stated limit. ◐ A partial function. ? Not established. A listed device function does not establish a complete routine, its other equipment or any plan requirements.
Setup and sources
Apple Home
No Apple Home path exists, and the reason is architectural rather than a missing integration: this sensor's only route anywhere is the YoLink Hub, whose own compatibility list enumerates Alexa, Google, IFTTT, Home Assistant and Raedius with no Apple Home and no Matter. There is no per-device workaround behind a hub that does not speak Apple.[2][14]
Google Home
Not established for this sensor specifically. YoLink's hub page names Google among its platforms, and everything this sensor does reaches the outside world through that hub — but the sensor's own content names Alexa, Home Assistant and IFTTT without naming Google, and this catalogue does not fill a per-product gap from a hub's list. An honest unknown rather than an inherited yes.[1][11][12]
Alexa
YoLink lists Alexa for this sensor. It does not say how the sensor reaches Alexa or what Alexa can do with it, so nothing beyond the name is confirmed.[1]
SmartThings
Same architectural absence as Apple — SmartThings is not among the platforms YoLink's hub names, and the hub is this sensor's only path off the LoRa network.[2][14]
Home Assistant
Home Assistant's own YoLink integration names the Water Leak Sensor 4 (YS7906-UC) among the devices it is tested with, and YoLink lists Home Assistant for this sensor too. It works through your YoLink account over YoLink's cloud, so it stops working when the internet or YoLink's service is down. Neither says whether leak alerts show up in Home Assistant, so leak alerts there are unconfirmed.[1][15][16]
Listed device functions are established from vendor documentation. An ability missing here is unestablished, not necessarily absent.
Connection details and setup sources
Ecosystem
Support
The catch
Amazon Alexa
◐Works per the maker; details unconfirmedWorks per the maker; details unconfirmed — see the catch[1]
YoLink lists Alexa for this sensor. It does not say how the sensor reaches Alexa or what Alexa can do with it, so nothing beyond the name is confirmed.In Amazon Alexa you also need: the maker's own hub
Google Home
?InconclusiveWe researched this and the evidence doesn't settle it — the catch explains why[1][11][12]
Not established for this sensor specifically. YoLink's hub page names Google among its platforms, and everything this sensor does reaches the outside world through that hub — but the sensor's own content names Alexa, Home Assistant and IFTTT without naming Google, and this catalogue does not fill a per-product gap from a hub's list. An honest unknown rather than an inherited yes.
Apple Home
✗Doesn't workVerified: does not work with this ecosystem[2][14]
No Apple Home path exists, and the reason is architectural rather than a missing integration: this sensor's only route anywhere is the YoLink Hub, whose own compatibility list enumerates Alexa, Google, IFTTT, Home Assistant and Raedius with no Apple Home and no Matter. There is no per-device workaround behind a hub that does not speak Apple.
SmartThings
✗Doesn't workVerified: does not work with this ecosystem[2][14]
Same architectural absence as Apple — SmartThings is not among the platforms YoLink's hub names, and the hub is this sensor's only path off the LoRa network.
Home Assistant
◐Works per the maker; details unconfirmedWorks per the maker; details unconfirmed — see the catch[1][15][16]
Home Assistant's own YoLink integration names the Water Leak Sensor 4 (YS7906-UC) among the devices it is tested with, and YoLink lists Home Assistant for this sensor too. It works through your YoLink account over YoLink's cloud, so it stops working when the internet or YoLink's service is down. Neither says whether leak alerts show up in Home Assistant, so leak alerts there are unconfirmed.In Home Assistant you also need: the maker's own hub
? Inconclusive means we researched that ecosystem and the evidence doesn’t settle it — the catch says why, and the sources are listed below. It is a statement about the available evidence, never a verdict on the product. A Setup Check researches your exact setup where the official sources don’t answer.
Vendor account required: Yes — you must create a vendor account to use it. (established from the vendor's own setup steps, where signing in is mandatory before the device can be added)[4]
No fees. YoLink states the policy at the brand level on its hub page — 'we have zero monthly subscription fees with using any of our hubs and YoLink devices' — which covers this sensor by its own terms. YoLink also names 'Smart Device Integrity Monitoring (24/7 supervision)', a check that the sensor is still alive and reporting; unusually for this catalogue, that supervision is described as part of the product rather than as a monitoring tier.
Maintenance and offline use
Batteries: AAA x2 — manufacturer-stated 60 months per set
Works without the internet: Partly — some of it keeps working and some of it does not. See the detail below.[5]
Two standard AAA alkaline cells with YoLink claiming '5+ year battery life' — recorded as 60 months, the floor of a '5+' claim rather than a generous reading of it. That runtime is the direct payoff of LoRa: a low-power long-range radio instead of WiFi, which is what lets a sensor sit untouched under a sink for years. Housed to IP66 with a 105 dB piezo sounder on board.
Security updates: No security-update support date is on record for this model yet. We haven't yet checked whether YoLink publishes one, so this is a gap in our research — not a statement about the manufacturer.
Who it's for
Anywhere a leak would go unheard for days and WiFi does not reach well — a crawlspace, a well house, a basement corner of a big property — where the quarter-mile LoRa range and a five-year battery matter more than a broad ecosystem. Add the freeze alerts and it covers the two ways a pipe ruins a winter. Not for Apple Home or SmartThings households: there is no path in.
This opens YoLink's own website. We earn nothing from this link.
Sources & method
Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →
17 numbered sources· read them in the source's own words
Backs: Product identity, Price, Protocols, Power source, Installation, Required hub or bridge, Subscription, Batteries, Market availability, Research status, Amazon Alexa compatibility, Google Home compatibility, Home Assistant compatibility
[6] No source was read for this entry. It classifies evidence this record already carries, and records the classification so it is not re-derived., verified 2026-08-22
[7] This record's own no-support integration answers and the entries backing them, re-read against the claim-basis rulings of 2026-09-09., verified 2026-09-09
[8] the record's own customer-facing prose fields as they stood before 2026-09-13 (no new external read), verified 2026-09-13
[9] Record-keeping entry: this record's existing answer of no Apple Home support now names the platform rule that reason rests on, 2026-09-15, verified 2026-09-15
[10] this record's own lifecycle note as it stood before 2026-09-19 (no new external read): its wording was rewritten so it reads in plain language. No fact, date, source or value changed, and the earlier wording is kept on this record., verified 2026-09-19
[17] Record-keeping entry: the Alexa answer for this sensor was re-graded under the rule that a maker naming a platform with no route and no list of what works earns a partial answer with the route unknown. YoLink's store data for this sensor, read in full on 2026-10-04, names Alexa only in the feature bullet "Alexa voice assistant, Home Assistant and IFTTT integration", with no way of connecting and nothing Alexa can do. The answer moves from full to partial, details unconfirmed, and the route and transport from cloud-to-cloud and cloud to unknown. No page was re-read for this entry: YoLink's store has been closed to us by a rate limit since 2026-10-09., verified 2026-10-19
Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.
Check YoLink Water Leak Sensor 4 with your setup.
Your platform, exact hub and the functions you need determine the answer. A Setup Check researches how they fit together.