Moen Flo Detector, WiFi Enabled Water & Moisture Sensor, 1 pc, 920-004

This alarm works perfectly at detecting water. A few caveats: As people mentioned, the pairing and Wi-Fi setup steps are missing from provided setup instructions, however, within minutes I located a short YouTube video that quickly filled in the blanks, and once you do this, it takes a few minutes to connect. Second caveat is that the provided alarm is very quiet. Your smartphone has louder ring options. So, you really need to rely upon the iPhone notification alerts to have a clue that it is going off, unless you are sleeping right next to your sump pump or wherever. I rigged mine to hang into a basement drain with the sensor on cord. Works. My sump failed, and I would never have known since I don’t go into basement daily and check, and dehumidifier regularly drains to this pump. I got a notification on iPhone from the Flo app while away from home, and checked sump upon return to determine sump had failed, but water was still in drain, so no overflow. I caught it early enough to minimize cleanup. It’s just a little, relatively cheap device, but it works.

The first one I purchased wouldn’t turn on at all. It is possible that the battery was dead as the little tab was not between the battery and the connectors inside the unit. I wasn’t going to go buy a battery to find out. So, I returned it and requested a replacement. The replacement came today. Again, the tab keeping the battery away from the connections was not in. It did turn on, and I was able to connect it to my app. Unfortunately, once I plugged in the sensors, all kinds of alarms went off, and it turned off the water in my house because it was synced with my flo turn off device. Even though the sensor was completely dry and on the counter, it said there was a critical leak. So, I deleted the device from my app and started it over. Went through the whole process and ended up with the same critical alarm. I was smart enough the second time around not to sync it to my water shut off so all I got was the alarm. BTW, the battery shows only 59%, so it’s been either on or is used. Anyway, I like my Flo Mo water shut off device but basically think this micro leak detector is worthless.

Humidity and temperature readings are very inaccurate. Tested against my other gauges temperature is off by 20 degrees and humidity by 10-15. I’ve had to turn off notifications for these. I’ve repeatedly tested the actual leek detector and it works fine. So just beware.

As other reviews state, the single unit I ordered arrived with the battery ajar and insulating strip off to the side so the battery had been draining since it was installed by the manufacturer. After setup, the Flo app indicated about 60% battery life remained. Will be good if Moen sends a new battery...time will tell. App installed on iPhone 13mini running iOS 16+. Many questions to answer to register but par for course these days. First try to connect to our home WiFi seemed to work (I had no prompt I entered my password incorrectly) but after finding the system not connected, I figured out the problem on second try. The app seems well designed. I set the acceptable operating range of humidity, and temperature I wanted and checked the boxes for email, text, and push alerts. After testing the hardware, I have yet to figure out how to delete the activity log, but the log can be filtered, collapsed and hidden. The alarm events can be deleted (just not the log). The primary sensor responded quickly to water. The main unit responds with beeping alarm for about 10 seconds and then stops and would not respond again if it remains sitting in water. If it dries, and is wetted again, a new alarm event occurs without manually resetting anything. The alarm beeping sound measured roughly 62dB at a distance of 5ft (1.5m). A nearby gas, forced-air furnace totally masked the sound of the alarming detector. Given the alarm shuts off after apprx 10 sec., one would need to be nearby, in the room to have a chance of seeing the LED or hear the alarm. (I believe most smoke alarms register around 95+dB for comparison). Don't count on hearing this alarm over other household noise. Disappointingly, the primary alarm sensor toggles to the remote sensor when the remote sensor is plugged in. I was hoping to place the primary sensor on a floor drain covering and the remote sensor under the washing machine so if the drain from other sources backs up or the washing machine leaks, I would get an alert. You have a choice of one sensor or the other, but not both. The remote sensor responded quickly to water. To bluntly test for low temperature, I set the low end of the desired operating range to 40F (4.5C) and placed the unit outside where the winter temperature was 28F (-2C). The unit sensed the 40F (4.5C) lower limit in roughly 15 minutes and triggered the text and emails as expected. This 15 min delay was comparable to another remote sensor for a smart thermostat I also placed outside (indoor room temp. was approx 70F (21C). I did not examine how loud or if the alarm sound changes between the different sources of alarm (cold or moisture) but I did not hear the alarm inside when and if it was audible outside. I have no experience with other similar sensors on the market today so a comparison isn't possible. I hopt these details can provide someone else useful information from which to make their own comparisons. I think for the price, and having experienced two human caused basement floods and one nature based flood during a deluge of rain, I'm satisfied with this purchase so far. Suggestions would be to allow for a volume adjustment of some sort (like toggle 62dB or 110dB) so the user doesn't have to rely only on text and email alerts, don't shut off one sensor when the other is active (better value for the $), add feature such as multiple emails to the app so that some users could receive alerts but not have access to the settings (i.e. for renters vs administrator, etc.) Hopefully my mostly positive impressions last as time goes on....speaking of which....how long does the battery last when it has 60% of life remaining....time will tell when the unit sends the 20% remaining battery warning I also triggered to 'on'.

I would look for something else. Initial setup was great. It lost connection and I was unable to add it back. When it works, it worked, but when it doesn't it is a brick. Did not get my money out of this.

This water detector works great... when it works. Battery died in a few months. During that time, it was constantly going offline, then coming back on, on its own. Seems to be susceptible to interference from nearby wi-fi devices. Before you buy it, just make sure your neighbors don't have kids with loads of wireless devices. I actually got a message saying "too many devices." Be nice if the water detector had an option of bluetooth. Update 10/1: Went offline, never to return. New battery and reset don't help. Worked for three months. Now dead. Can't recommend it.

Every home should have these. You put them wherever you could have a water leak. We have ours by our sump pump. I had a friend whose water hose that went to their washer leaked and flooded their home. One of these would have alerted them via the software application downloaded to your phone. They are good near toilets, sinks, basement doors, whatever you think you could have water. They give you peace of mind. These are excellent for leak detection. Moen is a leader in the industry and they standby all their products. You get what you pay for and these are worth every penny. The setup with the app was not the best trying to link the product, but I figured it out through sheer determination. This needs some attention from Moen.

—- After 4 years of use, was able to migrate all my devices to new Moen app. All of them working kind of ok. Same problems remain - dropped wifi, spurious alarms, high battery drain etc. stopped using extended sensor cable (long one) as it doesn’t work well. —- After 3 years of use, I am taking off another star. They frequently go in and out of WiFi, battery drain, and spurious alarms. Still a useful product though but not by much. --- Good product but with lot of kinks: - slick interfaces and basic leak detection works well and is very useful product - Battery housing poorly designed and the ends have to be adjusted to snugly fit the battery - when sensor is removed there is no indication, defeating the basic purpose of this device ** Because of this design flaw I test frequently by pouring water at the sensor every few weeks - not possible to delete old alerts (especially after testing) nor filter new and old alerts. - when it goes off line the alert comes with a lot of delay. Overall a decent product but cannot completely rely on it unless the sensor check is put in place.

Doesn’t work, I tried to returned but need to send to USA and costs a lot. Not compatible with app

I've been looking around for a battery operated water sensor, this one was a little on the pricey side. But the app was easy to use and setup. If you have a bandsteering unified wifi you might momentarily lose connection during setup if your phone is setup to use 5Gz, as this is a 2.4Ghz, the device will momentarily show disconnected during the setup phase, disconnect from your wifi and reconnect and you'll be fine, I had it up and running in 10 minutes. I dont know why people were complaining finding batteries for this, any of the big box stores have them. And if yours came with a dead battery return it for a new one.

I purchased 4 of these devices: The first 2 paired without issue and appear to be working fine. The battery on the first one died within a few days, and the 2nd one lasted about 2 weeks before dying. These use CRA123 batteries which do not come cheap. I was never able to pair the 3rd one, no matter what I tried; it always failed once I connected to the wifi network. I tried adding the network manually, I tried resetting the router, I tried changing the AP name, I tried manually connecting to the network, every single attempt failed, and customer service is of absolutely no use. The 4th one paired, and despite having a brand new battery (not the one provided) it reported the battery at 43%. I took out the battery, and the app never informed me that the device was offline, I even waited 20 minutes to see, and still nothing, it was reporting the same 43% battery level and offline. Bottom line: I would not trust these things to alert me in case of a water leak. Given the cost of each device, I would have expected it work flawlessly, but I'll be returning them and going with either Honeywell or pretty much any other brand. If your devices all appear to be working, I highly recommend doing a test to see if they are reporting correctly, dip the sensor in water, try taking out the battery, and see if the app reports it.

No instructions re setting up in box. Finally got it working after search youtube. Stopped working when wifi ( as a result of nbn outage) and haven’t been about to get it going since. Assuming battery supplied was depleted and can’t make any further suggestions until I purchase a battery - not a common one you have around the house so buy a few for future replacement

I finally caved and got some "smart" sensors for my home after being away during a cold snap and being unsure of the condition of my house. Having your heat go out or an undetected water leak is awful so while these detectors are a little pricey, I think it's a worthwhile investment especially if you're away from home regularly. I will say that the setup app and pairing process was way fussier than it needs to be. I bought an ecobee thermostat and that was way easier to set up, and I had to wire that thing to a furnace. I consider myself very technically inclined and the amount of pairing errors I got trying to set up four of these things made for a nightmarish afternoon. This is a single-instance pain point, though, and ever since these things have just been quietly monitoring. Battery life seems great - virtually no change in the last three months - and it's nice that the app reports a more precise reading than just "good" or "low". The configurable alarms are nice too so that you don't get nuisance alerts for high humidity in a bathroom when someone takes a shower. It'd be nice if using the remote sensor didn't block the ability to use the base unit's sensors so you could monitor a wider area, but the cable on the remote sensor is long enough that you should be able to find a good monitoring position. Overall, I'd recommend these to pretty much everyone. The earlier you can respond to an emergency, the less damage you'll likely have to deal with.