I have revised my review from 2 stars to 4 stars and here's why.
First, the detectors work great for detecting any slight bit of water. The alarms on the devices go off and are plenty loud. The problem was the app on my phone was not notify me when testing the alarm. Their tech support provided no help on this issue either. What I discovered was our WiFi was both 2.4G and 5G and our SSID for both was the same. The Govee only works with 2.4G NOT 5G. So, by default the Govee app was not connecting with the 2.4G automatically. To solve this problem I had to go into my router settings and change the SSID name for 2.4G so that it was different from the 5G's SSID. After doing so, I went to my phone's WiFi settings and now saw 2 choices for our WiFi, one for 2.4G and one for 5G. I selected the 2.4G WiFi choice from my phone's wifi choices and then went through the Govee set up process from scratch with the 2.4G WiFi choice selected on my cell phone and LO AND BEHOLD the notifications now work!! After setting everything up, I could now go back to the 5G SSID on my phone without it affecting the Govee. Tested the alarm sensors after doing this and they sent the alarm notificaiton to my phone as advertised. Problem solved! I now give it 4 stars.

Following the app instructions it was easy to install and it all tested fine as well. One thing that can be improved is to have default sensor device names have some connection to the serial number imprinted on the sensor so we can easily tell which device listed in the app corresponds to which sensor.

I recently purchased the Govee WiFi Water Sensor 3 Pack, and I can confidently say that it's one of the best investments I've made for my home. These little devices are absolute lifesavers when it comes to protecting your property from water damage.

Installation was a breeze - just a matter of connecting them to my 2.4GHz WiFi network (note: they don't support 5G WiFi). Once set up, they worked seamlessly with the Govee Home app, allowing me to monitor the status of each sensor from my phone.

The 100dB adjustable alarm is loud enough to get your attention, even in a large house. It's a reassuring feature knowing that you'll be alerted immediately if there's even a hint of water where it shouldn't be. The fact that you can customize the sensitivity level ensures that false alarms are kept to a minimum.

But what truly sets the Govee WiFi Water Sensor apart is its ability to send email alerts. This means you're not reliant solely on the app - you'll receive a notification even if you're away from your phone. This level of responsiveness is crucial for avoiding major water damage incidents.

The sensors themselves are well-built and feel durable. They're compact enough to be discreet, yet sturdy enough to handle any potential moisture. I placed one in my basement, another in the laundry room, and the third under the kitchen sink - all high-risk areas for leaks and water damage.

Since installing these sensors, I've had a couple of instances where they detected water where it shouldn't have been. In both cases, I was able to address the issue before any serious damage occurred. It's incredible how much peace of mind these sensors provide.

The battery life is impressive. I've had them for several months now, and they're still going strong. The low battery alerts are another thoughtful feature, ensuring that you're never caught off guard.

In terms of value for money, this pack of three sensors is reasonably priced considering the level of protection they offer. When you compare it to the potential cost of water damage repairs, it's a small price to pay for such a valuable safeguard.

In conclusion, the Govee WiFi Water Sensor 3 Pack is a must-have for any homeowner. It's reliable, easy to install, and provides an extra layer of security against water damage. Don't wait until it's too late - invest in these sensors and save yourself from potential headaches and costly repairs down the line. I highly recommend them to anyone looking to protect their home and belongings.

The set up was awful. I tried everything, from turning off 5g, restarting everything, moving it around, you name it. I could not get this thing to connect using my iPhone 14. I was just about fed up and was going to return them , and after Googling for an hour, I found a post where someone said use an iPad to do the config"”and when I did, no issues and it breezed right through the set up! But still, the instructions and app are pretty bad. BUT, once it all got connected, it's actually pretty good. The sensors respond to a drip of water on them and also if they are sitting in water. They have an audible alarm on them and send alerts to your phone. So far so good.

I received the item and a box of five more sensors about an hour ago. I am professional at home construction, including the plumbing trade. Here's what I found.
After setting up the first sensor to the internet, I proceeded to place that one under my kitchen sink. I looked under the sink with a flashlight and didn't notice anything on the bottom of the sink cabinet, so I slid the sensor to the back of the cabinet. On doing so, I felt a dampness on the palm of my hand as I placed the sensor. There was a film of water on the bottom of the cabinet. I waited to see if the sensor would go off, as it did when I tested it by wetting a finger and putting it across two of the terminals on the bottom of the sensor. Well, that film of water did not trip the sensor. Wondering why, I placed the sensor on a flat piece of plastic on my work bench and I could see there is a 1/16 inch or so of space between the sensor probes and the flat plastic sheet I put it on. That's the problem right there. A film of water on the bottom of a cabinet will not set the sensor off. The probes will not contact the water surface.
Here's what I did. I removed the little rubber plugs from each of the four feet of the sensor. Use a sharp object. I placed the sensor on a piece of sand paper on a very flat surface. Rubbing down on the sand paper I sanded the plastic feet down to the same level of the metal probes under the sensor. Now the probes will touch the surface the sensor is resting on. I tried the sensor under the sink again and it immediately tripped the water alarm. A slow drip will not make a puddle of water in a cabinet. It will most likely coat the bottom of the cabinet as it's being absorbed into the wood or leaking out at the seems of the cabinet.
Something about kitchen cabinets: The bottom of kitchen and bath cabinets is usually made of cheap particle board or some material equally water absorbent. A small drip will not form a puddle of water as you might think. The bottom of the cabinet will absorb a small water leak, like a very slow drip, for MONTHS. Probably until the bottom of the cabinet is ruined. You will be able to tell by the bottom of the cabinet sagging down. But here's what I do with my sink cabinets. I put a heavy bead of caulk around the edge of the inside of the cabinet where the bottom of the cabinet meets the sides. Then I apply two or three coats of varnish to the bottom of the cabinet (we're talking INSIDE the cabinet here). What this does is make the bottom of the cabinet somewhat water proof, enough that the cabinet material will not absorb a small leak. And a larger leak will run out the FRONT of the cabinet, rather than down the seams between the bottom and sides of the cabinet. And you will notice it before damage is done.
Now, the Govee setup. I did find the setup a little confusing I'll admit. Especially when setting up to the internet. The app wanted me to connect my phone to the wifi of the gateway unit that comes with the sensor. I'm thinking, do I want to do that? And lose my home wifi on the phone? I ended up backing out of the setup. But going back into the app again, I found it was working. I pushed the buttons as directed and setup the 6 sensors I had without issue. As you do each one, and are looking for it in the app screen, pull down the screen to refresh it and you'll see the device you connected.
I gave four stars because: The directions could be a little more precise with the wifi setup of the gateway. The sensor probes should be lowered to pick up any amount of water.
Note: The first sensor I installed saved me a big headache had the dripping fitting decided to break sometime down the road. This one find paid for the sensors I put in today. An overall excellent product. Just sand down the feet.
UPDATE: 6/29/21 - I had a sensor alarm in my bathroom vanity sink cabinet. I removed the stuff stored under the sink and didn't see anything around the sensor. I moved the sensor and carefully felt the area with my fingers. With no visible water, the area felt slightly damp to the touch. I took a closer look at all the plumbing with a flashlight, and sure enough, one sink supply connection was the slightest bit wet. Maybe one drop per hour.
My description above on how I modified the sensor probes to touch the surface (floor, etc.) had allowed the unit to alarm well before any water started to puddle and soak into the wood and ruin the cabinet.
I highly recommend these water sensors and that you modify them as I suggested above.