Review Summary - Awesome I recently purchased the YoLink Hub and Water Sensor pack on Amazon and the YoLink 3/4 motorized water/gas valve shut off from their direct site.  All products worked fantastically. I was not thrilled with the idea of yet another hub in my Smart Home but the reviews (and no availability of SmartThings water sensors) led me to try YL and I am so glad I did. I love this brand now: set up was faster than zwave/zigbee, works without internet, and flawless integration with Amazon's Alexa.  5 Stars hands down and another 5 for the future - make sure to follow them on FB. Below are some other things I would like to share.  When to buy water sensors - Every time someone shares a wet story A couple of years ago, my cousin's house flooded after his girls filled the sink with water (washing their face like they down in the movies) and then left for school... He had to live at my parent's lake cottage for the winter (~3mo) in upstate NY.  Family of 4, dog, and cat in a 2 bedroom ranch with no laundry.  At that time, I decided that since their deductible was $500, I was going to spend that much on a solution: a dozen ST water sensors and a Dome bolt-on valve control. Every time I have a water issue, a close call, or hear a story about someone who had an issue - I buy a few more.  The latest was a co-worker whose parents went to Florida for the winter.  Apparently, a bird died in their HVAC exhaust pipe, slide down, and errored out the furnace (CO2 protection feature). Since they had no smart devices to warn them about the cold house, the pipes burst and no one knew.  When they came back 3 weeks later... eww.  That's when I found and joined the YoLink system!  Use Cases - Start low in each room I am not a plumber or insurance claims agent: these are just my thoughts that work with my house. I first started out with 1 water sensor in each bathroom. I put them by the toilet with the thought that if a sink also had an issue, at some point it would make it out of the cabinet and onto the floor and get to the sensor.  It won't help with small leaks that will just go through the cabinet and into the floor/ceiling etc, but it's a start since water damage can happen almost anywhere.  You can always go back and add another to each room (see above "when to buy").   I had an issue where my hard water was leaving sediment in my washing machine's solenoid causing it to stay in the open position.  We came home to a door-open front-end machine almost ready to spill over.  Now we have a sensor in the laundry room.   We had high water pressure in our house which was causing our on-demand tankless heater pressure relief valve to started to let out a steady stream. We had a sensor there to cut off the water and save the day. I now have a pressure regulator (WATTS) and water e-treat (WATTS) system! Speaking of which, not that I don't trust my plumbing work - but the areas I was working with, I put a kids snow sled under my work when I was done to collect any water and put a sensor in it.  No leaks BTW!  Speaking of the sled to collect water - I use decorative square planters to put my bedroom and living room humidifiers in during the Winter with a water bud in each. Last winter, the side of one of the humidifiers broke and messed up my living room hardwood floors.  I use a shoe/boot tray for the cat's water fountain and a sensor just in case they knock it over.  I actually do the same with my hot-water tank too - ensures it will hit the senor and buys a few minutes between the valve shutting, water leaving the system (pipes above), and someone to get there.   Last Thoughts I am excited to build on the YoLink system, I plan on picking up an alarm and some of their other unique products coming out - smoke alarm, CO2 alarm, outdoor alarm, outdoor motion sensor, outdoor contact sensor, etc.  Pretty exciting stuff. BTW, I was not paid in any way for this review, and I am not new to the smart home space - I use everything in my house Tuya, ST, LIFX, Hue (which sucks - Paul Hibbert is correct on that) so I am not just blown away with the novelty of this, I think its a great brand that has a lot of potential with the LoRa.