Research profile · verified 2026-08-18 · sources re-checked 2026-11-02
YoLink Water Leak Sensor 1
Compiled by SmartHomeWorkflow Research · YoLink · Water Protection & Plumbing · ~$16.99 (Price at the time of research — $16.99 read from YoLink's own storefront on 2026-08-18 (model YS7903, single version, in stock). ⚠ The $16.99 is not the entry price for a first YoLink purchase: nothing in this brand reaches an app without a hub, so budget the YoLink Hub alongside it — the same rule applied here to THIRDREALITY. Never treated as a live price.)
⚠ Similar names, different products: ⚠ The number is a model generation, not a capability tier, and on this pair the difference is one a buyer feels in the middle of the night: the Water Leak Sensor 4 (YS7906) carries a 105 dB sounder on the device and low-temperature alerts — THIS sensor has neither. YoLink's own description for the 1 tells you to buy a separate siren: 'Pair your sensor with the YoLink Siren Alarm, for an attention-getting, high-dB alarm activation.' The Water Leak Sensor 2 (YS7904) sits between them, and a 'MoveAlert' version of the 4 adds removal detection. All are on the storefront at once, so check the YS number rather than 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's own wording for this sensor: 'A YoLink hub with an internet connection is required for full functionality.' ⚠ Note what that sentence adds beyond the sibling's — it names the INTERNET as well as the hub, where the Water Leak Sensor 4's page scopes the requirement to 'full app notifications and automation functionality'. The page also names device-to-device pairing to YoLink sirens and valves that 'works without internet and without power', which YoLink calls a 'back-up' or supplemental setup. The leak alert to your phone still needs the hub and the internet, because this sensor has no sounder of its own.
Yes — and on this model the dependency is total rather than partial. YoLink states it plainly: 'A YoLink hub with an internet connection is required for full functionality.' This sensor speaks LoRa and nothing else, so without a hub it cannot reach an app, a phone or any smart-home platform — and unlike the Water Leak Sensor 4, it has no sounder of its own, so a hubless unit detects the water and then has no way to tell anyone. What YoLink offers instead of an onboard alarm is a second purchase: 'Pair your sensor with the YoLink Siren Alarm, for an attention-getting, high-dB alarm activation.' Budget the hub (~$23.59–$29.99) on top of the sensor, and a siren too if nobody will be watching a phone.[2][16][23]
Apple Home · Doesn't work
This connection does not work
No supported connection
YoLink Water Leak Sensor 1×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, and a fresh read of that hub's page found the words 'Apple', 'HomeKit' and 'Matter' absent from it entirely while it enumerates Alexa, Google Assistant, IFTTT, Home Assistant and Raedius. A platform the bridge cannot reach is not reachable by the device behind it — which is why this is an evidenced absence rather than an unknown.[4][14][24]
Google Home · Inconclusive
This connection is not confirmed for this model
Connection not confirmed
YoLink Water Leak Sensor 1?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 — a 'Compatible with Others' strip reading 'Alexa Google IFTTT Home Assistant', re-read on 21 September 2026 — and everything this sensor does reaches the outside world through that hub. But the sensor's own content names Alexa, IFTTT and Home Assistant 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, matching the position taken on the sibling record.[3][11][12][14][24]
Amazon Alexa · Works
How it connects to Amazon Alexa
Follow the recorded connection below. Equipment details and setup limits explain what else this path needs.
Account link
The documented connection
YoLink Water Leak Sensor 1
YoLink Water Leak Sensor 1YoLink Water Leak Sensor 1
→Device connection
YoLink hub or bridgeRequired hub or bridge
→Internet
Cloud serviceInternet connection required
→Account link
Amazon AlexaPlatform 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's own wording for this sensor: 'A YoLink hub with an internet connection is required for full functionality.' ⚠ Note what that sentence adds beyond the sibling's — it names the INTERNET as well as the hub, where the Water Leak Sensor 4's page scopes the requirement to 'full app notifications and automation functionality'. The page also names device-to-device pairing to YoLink sirens and valves that 'works without internet and without power', which YoLink calls a 'back-up' or supplemental setup. The leak alert to your phone still needs the hub and the internet, because this sensor has no sounder of its own.
Named in YoLink's own content for this sensor — 'Alexa voice assistant and IFTTT integration' — and again on the hub's compatibility list, which is the only route this device has to any platform since the sensor itself speaks LoRa and nothing else. YoLink frames the use case in the same breath: 'Be alerted with your smart home speaker at the first sign of a water alert!' On a sensor with no sounder, that speaker is doing the job the hardware doesn't.[1][2][15][16][22][23]
SmartThings · Doesn't work
This connection does not work
No supported connection
YoLink Water Leak Sensor 1×SmartThings
The record does not support a connection to this platform. Read the explanation below.
Same architectural absence as Apple, on the same fresh hub read: SmartThings does not appear on the YoLink Hub's page at all, and the hub is this sensor's only path off the LoRa network.[4][14][24]
Home Assistant · Works per the maker; details unconfirmed
Equipment needed for this connection
Connection setup needs a check
YoLink Water Leak Sensor 1?Home Assistant
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's own wording for this sensor: 'A YoLink hub with an internet connection is required for full functionality.' ⚠ Note what that sentence adds beyond the sibling's — it names the INTERNET as well as the hub, where the Water Leak Sensor 4's page scopes the requirement to 'full app notifications and automation functionality'. The page also names device-to-device pairing to YoLink sirens and valves that 'works without internet and without power', which YoLink calls a 'back-up' or supplemental setup. The leak alert to your phone still needs the hub and the internet, because this sensor has no sounder of its own.
YoLink lists Home Assistant integration for this sensor, and Home Assistant is on the YoLink Hub's list too. It does not say how the sensor reaches Home Assistant through the hub or whether leak alerts show up there, so leak alerts in Home Assistant are unconfirmed, and whether it works when the internet is down is unknown.[2][16][21][23]
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, and a fresh read of that hub's page found the words 'Apple', 'HomeKit' and 'Matter' absent from it entirely while it enumerates Alexa, Google Assistant, IFTTT, Home Assistant and Raedius. A platform the bridge cannot reach is not reachable by the device behind it — which is why this is an evidenced absence rather than an unknown.
Not established for this sensor specifically. YoLink's hub page names Google among its platforms — a 'Compatible with Others' strip reading 'Alexa Google IFTTT Home Assistant', re-read on 21 September 2026 — and everything this sensor does reaches the outside world through that hub. But the sensor's own content names Alexa, IFTTT and Home Assistant 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, matching the position taken on the sibling record.
Maker’s hub or bridge. YoLink's own wording for this sensor: 'A YoLink hub with an internet connection is required for full functionality.' ⚠ Note what that sentence adds beyond the sibling's — it names the INTERNET as well as the hub, where the Water Leak Sensor 4's page scopes the requirement to 'full app notifications and automation functionality'. The page also names device-to-device pairing to YoLink sirens and valves that 'works without internet and without power', which YoLink calls a 'back-up' or supplemental setup. The leak alert to your phone still needs the hub and the internet, because this sensor has no sounder of its own.
Named in YoLink's own content for this sensor — 'Alexa voice assistant and IFTTT integration' — and again on the hub's compatibility list, which is the only route this device has to any platform since the sensor itself speaks LoRa and nothing else. YoLink frames the use case in the same breath: 'Be alerted with your smart home speaker at the first sign of a water alert!' On a sensor with no sounder, that speaker is doing the job the hardware doesn't.
Same architectural absence as Apple, on the same fresh hub read: SmartThings does not appear on the YoLink Hub's page at all, 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
—
Setup: Maker’s hub or bridge
Setup and sources
Maker’s hub or bridge. YoLink's own wording for this sensor: 'A YoLink hub with an internet connection is required for full functionality.' ⚠ Note what that sentence adds beyond the sibling's — it names the INTERNET as well as the hub, where the Water Leak Sensor 4's page scopes the requirement to 'full app notifications and automation functionality'. The page also names device-to-device pairing to YoLink sirens and valves that 'works without internet and without power', which YoLink calls a 'back-up' or supplemental setup. The leak alert to your phone still needs the hub and the internet, because this sensor has no sounder of its own.
YoLink lists Home Assistant integration for this sensor, and Home Assistant is on the YoLink Hub's list too. It does not say how the sensor reaches Home Assistant through the hub or whether leak alerts show up there, so leak alerts in Home Assistant are unconfirmed, and whether it works when the internet is down is unknown.
Home AssistantWorks per the maker; details unconfirmed[2][16][21][23]
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, and a fresh read of that hub's page found the words 'Apple', 'HomeKit' and 'Matter' absent from it entirely while it enumerates Alexa, Google Assistant, IFTTT, Home Assistant and Raedius. A platform the bridge cannot reach is not reachable by the device behind it — which is why this is an evidenced absence rather than an unknown.[4][14][24]
Google Home
Not established for this sensor specifically. YoLink's hub page names Google among its platforms — a 'Compatible with Others' strip reading 'Alexa Google IFTTT Home Assistant', re-read on 21 September 2026 — and everything this sensor does reaches the outside world through that hub. But the sensor's own content names Alexa, IFTTT and Home Assistant 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, matching the position taken on the sibling record.[3][11][12][14][24]
Alexa
Named in YoLink's own content for this sensor — 'Alexa voice assistant and IFTTT integration' — and again on the hub's compatibility list, which is the only route this device has to any platform since the sensor itself speaks LoRa and nothing else. YoLink frames the use case in the same breath: 'Be alerted with your smart home speaker at the first sign of a water alert!' On a sensor with no sounder, that speaker is doing the job the hardware doesn't.[1][2][15][16][22][23]
SmartThings
Same architectural absence as Apple, on the same fresh hub read: SmartThings does not appear on the YoLink Hub's page at all, and the hub is this sensor's only path off the LoRa network.[4][14][24]
Home Assistant
YoLink lists Home Assistant integration for this sensor, and Home Assistant is on the YoLink Hub's list too. It does not say how the sensor reaches Home Assistant through the hub or whether leak alerts show up there, so leak alerts in Home Assistant are unconfirmed, and whether it works when the internet is down is unknown.[2][16][21][23]
Named in YoLink's own content for this sensor — 'Alexa voice assistant and IFTTT integration' — and again on the hub's compatibility list, which is the only route this device has to any platform since the sensor itself speaks LoRa and nothing else. YoLink frames the use case in the same breath: 'Be alerted with your smart home speaker at the first sign of a water alert!' On a sensor with no sounder, that speaker is doing the job the hardware doesn't.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[3][11][12][14][24]
Not established for this sensor specifically. YoLink's hub page names Google among its platforms — a 'Compatible with Others' strip reading 'Alexa Google IFTTT Home Assistant', re-read on 21 September 2026 — and everything this sensor does reaches the outside world through that hub. But the sensor's own content names Alexa, IFTTT and Home Assistant 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, matching the position taken on the sibling record.
Apple Home
✗Doesn't workVerified: does not work with this ecosystem[4][14][24]
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, and a fresh read of that hub's page found the words 'Apple', 'HomeKit' and 'Matter' absent from it entirely while it enumerates Alexa, Google Assistant, IFTTT, Home Assistant and Raedius. A platform the bridge cannot reach is not reachable by the device behind it — which is why this is an evidenced absence rather than an unknown.
SmartThings
✗Doesn't workVerified: does not work with this ecosystem[4][14][24]
Same architectural absence as Apple, on the same fresh hub read: SmartThings does not appear on the YoLink Hub's page at all, 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[2][16][21][23]
YoLink lists Home Assistant integration for this sensor, and Home Assistant is on the YoLink Hub's list too. It does not say how the sensor reaches Home Assistant through the hub or whether leak alerts show up there, so leak alerts in Home Assistant are unconfirmed, and whether it works when the internet is down is unknown.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)[6]
No fees, stated by YoLink at the brand level on the hub page this sensor depends on: 'Does a YoLink Hub require a subscription service? No, we have zero monthly subscription fees with using any of our hubs and YoLink devices' — wording that covers this sensor by its own terms. On a shelf where leak detection is routinely bundled into a monitoring plan, the absence of one is a real part of the value; the cost is front-loaded into the hub instead.
Maintenance and offline use
Batteries: AAA x2 — manufacturer-stated 60 months per set
Works without the internet: No — the core function depends on the vendor's servers, so an outage takes it with them.[7]
Two standard AAA alkaline cells, included, with YoLink claiming '5+ years 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 rather than WiFi, and it is what makes a sensor you will never think about again a reasonable thing to put behind a water heater. Sealed to IP67, the lower of the two ratings YoLink prints for it (its specification row says IP68), with the water-sensing probes built into the housing top and bottom. YoLink's store listing gives the working range as 32°F to 122°F (0°C to 50°C) for indoor use, while its specification says -4°F to 122°F (-20°C to 50°C); this page goes by the narrower range. The temperature range is a survival spec, not a freeze-alert feature: this model does not report low temperature at all.
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.
On the sensor's working temperature range, this page shows 32°F to 122°F (0°C to 50°C). YoLink gives this sensor's working range as -4°F to 122°F in its specification and as 32°F to 122°F, indoor use only, in its store description, so this page shows the narrower range.
Who it's for
Adding the fifth, eighth or twelfth leak sensor to a YoLink system that already has a hub and a siren — at $16.99 with a five-year battery and quarter-mile LoRa range, blanketing every appliance in a big or awkward property becomes affordable in a way WiFi sensors never manage. It is the wrong choice as a first or only leak sensor, and the wrong choice anywhere nobody will see a phone alert, because there is no alarm on the device. 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 →
26 numbered sources· read them in the source's own words
[8] 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
[9] the record's own customer-facing prose fields as they stood before 2026-09-10 (no new external read), verified 2026-09-10
[10] 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
Backs: Subscription, Google Home compatibility, Apple Home compatibility, SmartThings compatibility
page changed on 2026-11-02, after this reading
[25] YoLink's hub manual, https://shop.yosmart.com/blogs/manuals/ys1603-manual, could not be opened on 2026-10-09: YoLink's site asked us to slow down, and it can be tried again after 28 days., verified 2026-10-09
[26] Record-keeping entry: each maker disagreement on this page now says what is at stake for a buyer (the 2026-10-21 split into shown findings and research notes)., verified 2026-10-21
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 1 with your setup.
Your platform, exact hub and the functions you need determine the answer. A Setup Check researches how they fit together.