SONOFF Zigbee Indoor Temperature Humidity Sensor, SNZB-02D LCD Zigbee Thermometer Hygrometer, Works with Alexa & Google Home for Remote Monitoring and Home Automation, ZigBee 3.0 Hub Required, 1-Pack

I have quite a lot of Sonoff devices connected to several Hubitat hubs. These temp/humidity display sensors connected and functions seamlessly as expected. The screen is a decent size, is fairly clear and legible. I do wish the characters were a tiny bit thicker, but it’s not a problem. The screen surface can reflect quite a bit of light, but placement of the device can help with that. If the last two statements are a bigger deal for you, I recommend looking at the similar device by ThirdReality instead. Mounting options for this Sonoff device are great. Both the device and supplemental “dock” are magnetic. Using the dock to magnetically attach it to something allows you to remove it and place it somewhere else quickly. We just have the device itself magnetically attached to the side of a fridge. The dock comes with 3M tape so that could be used too. The kickstand swings down from the top of the device, it works well but has just one real position setting, but because it swings down you can’t really angle the device more vertical. This isn’t a big issue but it would help address some of the reflectiveness of screen. As far as accuracy is concerned, it has been pretty accurate based on my limited testing. I tested it for over a week of it sitting right next to the similar ThirdReality device and an old dumb temp/humidity display. All three were within a degree and humidity percentage of each other. If one was able to accurately calibrate it or had more advanced sensors, offsets could easily be added in whatever smart hub is used. When I finally placed the device in its final location, the temp and humidity updated fairly quickly both in Hubitat and on the display.

Big clear display and connects well with my Ziggee over ZHA dongle. It’s connected via a router on my mesh. Accurate readings measured with a thermostat. Took a few moments to figure out how to switch units.

The most important thing to me was how easy it is to hook up to SmartThings. I got this because someone on forums had recommended it because it is a Zigbee protocol device. Most time Zigbee devices can just be scanned for within SmartThings and you don't need to download any other special app. That was the case here although it was a bit of a puzzle on how to initiate pairing. It didn't actually say how in the little user booklet that has absolutely tiny writing in it in many languages. I had to find the manual online. It's such a simple thing why don't they just put that in large letters right in the front of the manual. All you really need to know on this thing is that you pull off the film so that the battery inside engages, then press the tiny little button on the back for about 5 seconds until the little broadcast icon starts flashing on the display. Then initiate a scan in SmartThings and it should pair pretty quickly and start showing the temperature and humidity within SmartThings. The other use of the button which is also not in the manual is that if you click it once it will change from C to F. Again basic basic stuff and it's not in the stupid little booklet they send, which really only tells you to go download their app which you don't really need. So that's why I'm deducting one star. I like the fact that this has a clear LCD display that's always on. A lot of these little units are just blank white plastic boxes. Accuracy is okay. It reads maybe 1° higher than my trusty mercury thermometer. I think it's more accurate than the little black thermometer unit shown in the photo. In SmartThings it responds perfectly and you can use it as a condition for actions. You can also see a nice graph of the temperature over hours and days. Nice. So what I really wanted to do with this was put it in my living room and have it turn on the air conditioning which is on a smart plug, during a certain portion of the afternoon, only if the temperature gets above for example 77F. My AC unit is perfectly safe to use turning it on and off with the main supply power. So: create a new SmartThings routine, as an IF precondition, set this sensor as equal to or greater than 77F. Then set the second IF main condition as a time range say 1pm to 6pm. THEN: turn on AC smart switch. If it never reaches 77F the AC won't come on. If it doesn't reach 77 until 3:30pm, it will only come on at that point. It works well, very very simple but effective. One could also set it to turn off in an evening time range as well if it reaches a certain temperature. But I have not needed to do that yet here in summer, since I always turn it off at sundown regardless and open the windows. This AC has a heat pump so I plan to use it in the winter too with a low limit temperature using the sensor. So this is maybe not as fancy as using something like a nest thermostat, but on the other hand it's very versatile, simple, cheap, and I can just use Smartthings alone, but also still turn it on and off with a Google home command.

Using with Home Assistant; the devices paired quickly and easily, and with a stable connection. They seem to be relatively accurate and responsive both in terms of temperature and humidity measurements, reporting whenever there is a change; though it's not like I have calibrated instruments to compare them to. The screen is clear and easy to read, and they'd be worthy even without the Zigbee functionality, as dumb temperature displays. Can't speak to long term battery or longevity; however the devices are still reporting 100% a few weeks in; if the battery lasts a couple years that would be more than fair. I do like that there are multiple ways to display them: using the included self adhesive cradle, or the built in kickstand. They look clean and fit in with modern design. All in, they're a good value, and I plan to buy more again.

Received my temp sensor last night. It works as intended. However, it was either preused or it sat on a shelf for a very, very long time. I removed the plastic tab that keeps the battery disconnected until purchase and the battery is almost dead. The screen randomly dims (its not backlit) so i assume a poor connection internally.

Worked perfectly with my Samsung Smarthings! Connected to Smarthings, created a routine to turn on a smart plug for my garage heater, and it worked effortlessly. Now, it turns it on and off per my temperature requirements. Couldn’t get Alexa with the built in temperature sensor to do this consistently. But this thing works great!

No way to connect to alexa. I have an echo dot max which has a zigbee hub/bridge internally. But it won't connect. The ewelink app won't even connect the sensor because it states it requires a zigbee hub/bridge to connect. Ive tried for many hours during many days. I wasted time. If there was a way to connect it... id keep them. But not even SONOFF has a support line i can call to get help.

The SNZB-02D is so sleepy that its its incredibly difficult to get working reliably at least w/the hubitat elevation c-5 that I have tried it with so far. It frequently takes hours long vacations, or does NOT bother to show up at all. Even the recent hubitat firmware update has NOT alleviated this problem, nor has the TUYA driver been much better. I HAD planned on returning it but I have since decided to see if I could not coerce it into behaving. I have just performed another full reset, or at least I hope that it is by removing the CR2450 battery and then repairing to the hubitat using the TUYA driver, and will let it run overnight as with my last semi-functional run. After that this has made me motivated to install an external zigbee dongle to one of my servers and get home assistant up and running, it also motivated me to finally purchase some USB extension cords for said dongle. Well, actually two as I also have a z-wave dongle but currently have zero z-wave devices. Looking at home assistant I see two ways of trying it out, first using the hubitat integration to see how that works, then if it does shelve that for a while, while I migrate my desktop to a new case. After which the plan is just to fully migrate to home assistant using my own radio dongles directly attached to the server and see how that fares v. the hubitat which has not been too bad excepting for communicating with this device. What gives me pause in the full migration scenario are the plethora of lights which have convoluted re-pairing enablement, i.e. the 2s on, 3s off, 2s on, etc. to trigger the pairing which would be very time consuming especially that some of them are on the outlying portions of the zigbee network coverage area, i.e. finicky at times, flawless at other times, the finicky bits happen when you least want them to. The c-6 isn't bad, however it has internal case antenna which may also be exacerbating the connection problem along w/the sonoff being stupidly sleepy, so much so that Im not even sure that I could update its firmware even if there was one available as other devices take upwards of 10m to update... So next step if this test today does not produce better results will be home assistant, and see if I can use both a dongle and the hubitat, and try the sonoff on the dongle connection, but I need to see if thats been done as it appears that hubitat integration to home assistant is to offload processing to home assistant while avoiding having to purchase dongles... (on the surface) I know that amazon will complain about comparing to other devices but i also in the same order purchased a similar temperature/humidity sensory from another manufacturer and that one worked out of the box, updating the firmware(10m) worked, and I have since bought a second for garage temperature readings. First one is used with some rules to control a heater in a room, a dumb heater controlled by a smart plug linked to some rules determining plug on and off and times of day that they apply, similar to another reviewers desire to control fans... But bottom line I cannot recommend this product as it is poorly designed and difficult to work with for its intended purpose, especially compared to well anything. Avoid until or unless they update their firmware and good luck updating existing units as they probably won't stay online long enough to successfully update to begin with...