YoLinkWater Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC

My system was working great until the hub failed BUT, the Yo Link Customer Service responded to my questions on how to fix by immediately sending me a new hub! It was free and very quick!

They do not understand a word of English ,I feel I have been transported to a hawkers stall in my home country.I had to call call to get a refundProducts are equally unreliable as the people behind it.Quick money

Nice and neat to have in the house for early notifications of water leaking

I do not often write reviews, but the YoLink sensors have been a great addition.Today, 12/3/2023, I was out and about. I received a notification on my phone that a leak was detected in the crawlspace. When I got home and went into the crawlspace I found water in the reported location (I use a naming convention so I know the type and location of the sensors).The leak was a slow drip and the water had pooled. Once the "tail" of the S2 sensor was wet I received the alert. This was a very slow leak and it took some time for the water to build up to touch the "tail". Sometimes it is hard to get the tail to lay perfectly flat. I try to place them in lower areas too. Perhaps if a simple change like rolling the "tail" sensor vs folding them would help, but I really can't complain. They are easy enough to straighten out.I mean how many times to do go into the crawlspace in a give year. A handful? So these play an important role in being proactive.I have looked at other sensors that are cheaper, but I do like the ecosystem and they are very reliable.I have water sensors (S1's and S2's) at key points in the crawlspace to detect this very thing. The battery life is amazing. They have been deployed for over a year and they still report having full batteries. It would have take a long time for us to know that we had a slow leak. That is if we found it in the first place. Like I said before we do not often go into the crawlspace or attic. So for what is worth these add value.I do wish they were priced a bit lower though.In my case I have Yo-Link sensors in the following areas:1) S1 - Crawlspace2) S2 - Crawlspace3) Motion Sensor - Mailbox4) Temp and Humidity - Crawlspace (to help monitor the duhimidifier) and Attic5) Outdoor Power Outlet - This allows for the remote control of the pump in the water feature (schedule control). Last year the water froze and part of the feature broke and had to be replaced. So I got this and am able to change the schedule when it is going to freeze. On the second plug I put an aquarium water heater stick that I can turn on to help keeping the water to freeze. The combination was way cheaper than other options.6) Vibration Sensor (available on the YoLink site) - I am going to buy one of these to put on the dehumidifier in the crawlspace. We had an error that we did not notice for about two weeks. This can trigger an alert in the absence of any vibration. I am going to give this a shot too once I save some money.

Product was fairly easy to install although some of the prompts weren't initiative. Tested product to make sure it's working. Bought it after a drain back up and am hopeful if it ever happens again this product will help me mitigate the damages. Small price to pay for in relation to the potential water damage.