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Availability:
Only 1 left in stock, order soon!
Arrives
Tuesday, Oct 20
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Number of Items: 5
Features
- Complete plug-and-play kit: hub plus Leak Sensor 1 units for whole-home coverage at toilets, sinks, water heaters, laundry, dishwashers, and sump areas.
- Long-range LoRa: reliable coverage where Wi-Fi struggles (up to 2,034 feet open air); get app, email, and SMS/text alerts and name sensors by location.
- Works even without internet: with YoLink Control-D2D, sensors can directly trigger YoLink sirens or shutoff valves for local protection during outages.
- Silent design: Leak Sensor 1 has no built-in siren; add SpeakerHub or a YoLink siren for audible or spoken alerts if desired.
- Scalable IoT platform: one hub supports 300+ YoLink devices; part of a whole smart home/building ecosystem; hub options include standard Hub, SpeakerHub, and Cellular Hub.
- Whats Included: This package includes 1 YoLink Hub and 4 Sensors5 items total. The Number of Items: 5 refers to the five individual products in the package, not five sensors.
Description
YoLink offers two leak sensors for different needs. Water Leak Sensor 1 is a quiet, discreet option that relies on phone notifications. Water Leak Sensor 4 adds a loud built-in siren, making it ideal for high-risk areas like basements or garages. Both connect to the YoLink Hub for instant alerts. Runs on 2 AAA batteries (included) for up to 5 years of nonstop leak protection. Stays connected up to 2034 feet, even through walls and floors where WiFi fails. Fully sealed design survives direct water contact, perfect for damp or flood-prone areas. Receive instant app, SMS, or email alerts. Works with Alexa, IFTTT, Home Assistant, and more. Power down? WiFi out? No problem. With YoLink’s D2D direct control, Leak Sensors continue to work seamlessly with YoLink Smart Valves and Water Meters, shutting off water the moment a leak is detected—no cloud, no delay, no worries. 1 YoLink Hub supports over 300 devices with long-range LoRa, ideal for large homes and even high-rise buildings. Reliable coverage where WiFi fails. Manage multiple YoLink systems across properties with Readius, a cloud platform for centralized monitoring, alerts, and reporting at scale.
Brand: YoLink
Color: White
Power Source: Battery Powered
Compatible Devices: Smartphone
Item dimensions L x W x H: 8 x 2 x 4 inches
Power Source: Battery Powered
Compatible Devices: Smartphone
Connectivity Technology: Wireless
Voltage: 3 volts
Control Method: App
Maximum Range: 1320 feet
Battery Average Life: 5 years
Sensor Technology: Contact Sensor
Item Dimensions: 8 x 2 x 4 inches
Unit Count: 1 Count
Brand: YoLink
Built-In Media: Batteries
Model Number: YS1603+4YS7903
UPC: 850024791565
Manufacturer: YoSmart
Mfr Part Number: YS1603+4YS7903
Color: White
Battery Cell Type: Alkaline
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Oct 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Number of Items: 7
After a colleague had a MAJOR leak that caused a lot of damage, I decided to get water leak sensors and picked the YoLink ones after a lot of reading/research. So far (about a month), I've been very happy with them. They were easy to set up and connect, and I tested each one by setting it in water to be sure it worked. All triggered a leak alert to my phone. We bought this starter kit as well as additional sensors to cover all anticipated leak locations at home. We connected the hub via ethernet to our router for stability and so far, all has worked well and has provided peace of mind for a reasonable cost. Initially, we had some trouble with losing the Internet connection, but then I discovered that it works best when plugged in using the actual plug - not just inserting the USB end into my power strip. Using the actual plug provides more stable power and since doing that, I have not had trouble with losing the Internet connection. When our Internet goes down (e.g. a storm or a need for a reboot), the YoLink router comes back smoothly most of the time. If it doesn't, unplug the hub from the router, reboot the router, then plug the modem & router back in, plugging the hub back in last.
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Reviewed in the United States on August 26, 2026 by Karen A. Wrobbel
Number of Items: 5
This Yolink water leak sensor system is really, really, excellent. I installed the hub and four sensors about a week ago and I am impressed. I first noticed the info about its LoRa radio link between the sensors and the hub. As an engineer I wanted to understand more about that technology. First, could it reliably maintain the link for that kind of distance, and second, can it do so with such a small battery draw to make it sensible for battery only powered sensors. If you read about LoRa on Wikipedia, along with the Chirp transmission method, you can see why it’s exactly the right radio link for small battery powered sensors at a long distance. It’s the same type of low speed data link that scientist use to track tagged animals in the wild. They need a small battery powered transmitter to chirp a few bits of data for as long as possible and over the longest possible distance. LoRa does that. And now the people at YoLink have used the same technology to build what appears to be the ideal system for homeowners to prevent a water leak from destroying property. One tech note here. When I first deployed the sensors in a guest house about 150 feet from the hub in my main house, I saw that the sensors were running with a radio link receive level of about -37dbm. That info is available from looking at the phone app. That is a very strong signal despite five or six walls and150 feet distance. However over about a day I noticed the radio link level dropped down to about -100 dbm. Even though one would think that is a low level, it’s actually still a good signal for a LoRa link. I think YoLink has done a very cool trick and have the sensors drop the transmitter level over a period of time in order to conserve battery life, at the same time still maintain a solid data link. That is why they are able to get years of life from a set of normal batteries in the sensor. It’s the perfect way to operate the alarm system. Loved the wired Ethernet connection option also. I suggest you use it instead of Wifi for the hub. I was so impressed with the initial hub and sensors after a couple of days I decided to go forward with purchasing the siren and water valve cutoff unit. I now have those in place and tested multiple times. The whole system works perfectly. When I place a moist paper towel under one of the sensors it alarms within seconds, the siren goes off, the water valve closes, I receive a notification on my iPhone, and an email as well. All four sensors were tested that way and they all four worked flawlessly. The hardware seems really high quality. Fit and finish, the cables for the hub and siren, and the sensors look to have good sealing to maintain the batteries in a dry and solid housing. I understand changing the batteries will be simple with just removing a few screws and taking the sensor apart. That is way better that just a clip like battery cover design. I did notice that the water valve hardware is not stainless steel. That will not be a problem if your water valve is inside, but mine is mounted outside. I plan to build a small housing to fit over the water valve to keep it out of the weather, along with keeping the steel hardware greased to prevent corrosion. But for the price, I think its an amazing device and system to same you from the disaster of water damage. Now a word about support, After I received the siren and water valve and got them paired to the hub it was not exactly clear if they were ready to automatically do their thing when a sensor alarms. So I called the support line and right away Clair answered and within a few minutes explained the process of getting things properly set up for automatic siren and water valve operation. She took the time to capture and send me screen shots of the app and stepped me through the process. The key is clicking on the Smart button on the app, then the automation button, then + to add a rule for each sensor. It’s quite easy if you just hit those buttons in the app. Setup took no more that a few minutes. Thanks Clair. I get the impression that YoLink has set the standard for a perfect water leak prevention system. The fact that’s it’s low cost is just an added benefit. And another note. My work involves taking care of high powered water cooled television transmitters across the country. I am planning to install YoLink sensors in every location. The cost is so low I will just add it to my monthly expenses. It’s not even a capital expense to do such an important upgrade to my remote sites. Just get the things, you will not regret it. Rick in Pacifica, CA.
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Reviewed in the United States on October 17, 2020 by Amazon Customer
Number of Items: 7
I am very please with this purchase! The water detection system was fairly priced and arrived in perfect condition. The set up procedure was straight forward and easy to complete. Once the hub and remote sensors were joined the sensors communicated with the hub perfectly, the distance or wall obstructions have not hampered the connection. The app has been easy to navigate and quick to signal an issue when tested during setup. The app shows the battery levels for all sensors individually. I feel comfortable now having this system monitor my home and know that if a leak does happen I will be given the warning and be able to avoid an unwanted flood.
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Reviewed in the United States on October 12, 2026 by AC
Number of Items: 3
TLDR: If you own a home, you NEED these. Plain and simple. Buy them, set them up, forget about them, and they will save your ass WHEN something leaks. Because eventually, something WILL leak. As a first time home buyer, I got paranoid about the stuff I couldn't control. What happens when the sink, the dishwasher, the water heater, the fridge, or anything else decides to leak while I'm asleep or away from home? I did some research and found these YoLink leak detectors. They have saved my ass multiple times and have EASILY saved me 10's of thousands of dollars by telling me about a leak the second it started, instead of days later when I happened to walk by and notice it. Example: I had a sensor in the basement next to my water heater and sump pump. We got 6 inches of rain overnight and one of my sump pumps failed. At 2am this thing went off and woke me up (via 'priority notifications' on the iPhone, sends a loud alert even if your phone is on silent). I ran downstairs and found water already seeping into the basement in a couple of spots, and it was coming in FAST. I got the pump running again, rode out the storm, and replaced the pump once things calmed down. Without that sensor, I would have slept straight through it and woke up to ankle deep water and tens of thousands of dollars in remediation. Instead, I was out a new sump pump and a few hours of sleep. Setup is extremely simple. Order the hub with a few sensors, connect the hub to your wifi/ethernet, stick the sensors under anything that can leak, set up your notifications and alarms and you're done. From then on you sleep peacefully knowing that if something leaks, you WILL be notified and you can actually do something about it. No subscriptions or monthly fee BS. You buy them once and they just work. Seriously, order these things. What you spend today is nothing compared to what one missed leak costs you. I've got like 8+ leak sensors all around my home at this point.
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Reviewed in the United States on September 14, 2026 by Keaton
Number of Items: 5
The system is fairly easy to set up. It probably took me 20 minutes with 4 sensors. I ended up using the cable to connect the basestation to my router after some trouble getting connected tirelessly. The system has been in place a few months and already helped detect a leak under the kitchen sink that could have caused significant damage. We would not have found this leak without the YoLink system in place. I am considering buying another set. Definitely recommend this product.
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Reviewed in the United States on July 6, 2026 by Amazon Customer
Number of Items: 5
The YoLink hub and four sensor pucks were easy to set up. I am moderately tech savvy and it took perhaps 30 min. Instructions were easy to follow. I primarily purchased the kit to detect leaks from the water heater, but since it came with three additional sensors, I put them under all of our sinks. The power went out one day and I received an alert on my phone. I particularly like that you can link multiple phone numbers to the hub so my spouse also receives alerts. Having had a previous house flood twice due to plumbing issues while we were traveling, this is definitely a worthwhile purchase. YoLink offers other kinds of sensors too, so super helpful if you have a vacation home or something like that. Highly recommend.
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Reviewed in the United States on October 9, 2026 by J. Burke
Number of Items: 5
I cannot recommend the YoLink Water Leak Starter Kit enough. After dealing with a minor basement leak last year that went unnoticed for two days, I knew I needed a reliable detection system. I did a lot of research before settling on YoLink, and honestly, this system blows the standard Wi-Fi sensors out of the water. Here is why this kit deserves a full 5 stars: LoRa Long-Range Technology is a Game Changer: This is the main selling point. Unlike standard smart home devices that struggle to stay connected in my basement or utility closet, the LoRa (Long Range) tech punches through walls and concrete with zero issues. I have one sensor in a detached garage about 100 feet from the house, and it has full signal strength. Ridiculously Easy Setup: I am not a super technical person, but I had the Hub and all 4 sensors up and running in under 15 minutes. You just scan the QR code in the app, and it connects instantly. No fiddling with complicated Wi-Fi passwords for each individual sensor. Silent but Deadly Accurate: Note that these are the "Silent" version of Sensor 1. They don't scream at you with an onboard siren, which I actually prefer because I have pets that would be terrified by a loud alarm. Instead, the Hub handles the audio (if you want it to), and the phone notifications are instantaneous. I tested one with a wet paper towel, and my phone buzzed within 2 seconds. The App is Fantastic: The YoLink app is clean, intuitive, and lets you set up all sorts of automation. You can even configure it to send emails or texts to family members if a leak is detected while you are on vacation. The Bottom Line: For the price of a single plumbing visit, you get a Hub and four reliable sensors. If you own a home, this isn't just a gadget; it is essential insurance. Do yourself a favor and buy this before you need it!
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Reviewed in the United States on January 22, 2026 by Vinh C
Number of Items: 5
Thanks to these sensors, our basement was saved for extensive damage if we didn’t have them! We had over 9 inches of rain in the span of 4 hours and these detected water immediately! Saved our wood floors and furniture! Super easy to install. Alarms are LOUD! And the alarms notify you via the app.
Reviewed in the United States on October 12, 2026 by Mora626