YoLink 2-Pack X3 Version Temperature Humidity Data Logger, Longest Wireless Range, 5+ Years Battery, Emails/Text/App Alerts, Alexa, Best Freezer, Greenhouse Monitor. Hub Included

I have 18 YoLink devices/sensors at my house. I love the system and all the various sensors it supports. Everything is very long range RF that has no problem going through exterior and interior walls and floors.I have one of these in the fridge, the other in the freezer. They work very well. It takes about half an hour the first time you put them in place for the reporting and accuracy to stabilize.You can get temp and humidity readings on the app, and some very handy graphs of how temperature changes over time. You can see low/high/average temperatures and lots of historical data. I'm a data geek - I love knowing all about things. You need the inexpensive hub and just one sensor to get started. Lots of bundled deals are available.Like all YoLink sensors, you can set alerts if things fall outside a predetermined range (of temp and humidity in this case). Alerts can be any combination of app alert, text, and email. You get a certain number of free alerts a month, after which you can buy inexpensive 'alert bundles'.You can name all sensors - I use their actual locations in the house/yard so I can instantly see where the problem is. I have two outside sensors - one on the mailbox, the other on a gate. Works over the Internet, not just local wi-fi.Highly recommended if you need such measurements. All the YoLink sensors I have (all 18 of them) have been reliable and consistent. The water sensors have saved me twice now from potentially expensive water leaks (80 year old plumbing). The app even shows battery levels for every sensor. Just magical.

Easy setup and have worked flawlessly. These are the only ones I could find to cover the temperature range I was looking for which is much greater than most all others plus wireless and I monitor them easily from my phone

Bought to interface with my other YoLink stuff which all work great. My neighbor goes down south for a few months a year in the winter and after having some furnace issues, was worried about his furnace crapping out when he was gone. His house is about 300 yards away, so I got this to throw in his house and alert me if the temp dropped below 50F. If it did, I’d let him know and he could call his HVAC guy to fix it while he was out of town. He doesn’t have internet in his house, but I do, so being able to tie this into my hub and use my internet was great. Had great signal at 300 yards plus going through a garage and a few interior walls. Battery life was great for the three months, showing no decline in full power (although I did set it to transmit readings every hour instead of constantly). I only wish their UI for settings was a little more friendly, as there is not much description as to what some of the settings are doing without some trial and error. Other than that, all my YoLink stuff has been great. They use Li ion AA batteries, so when the originals eventually do die, replace them with the same. Alkaline batteries won’t last as long, especially if the sensors are outside during weather shifts. My driveway sensor has been alive for over two years on the original batteries and it alerts about 10 times a day because the turkey and deer seem to enjoy hanging out at the tree it’s mounted to…

SMS feature is free, but they only allow a couple hundred SMS messages for free per month, but if you're getting more than 10, you've obviously got a problem! Also shows temp and humidity graphs which basically tells you approximately when the doors are opened. Worked so well at home, I installed them in the freezer and walkins at my restaurant and the signal does indeed travel through the big metal doors without issue. The phone APP fires up very fast. You can also add other users and specify which temp sensors they can monitor or edit. These are nearly commercial grade and the price is really good. I have used other temp sensors 2x or 3x the cost that had less features. Tested temp performance with digital and analog thermometers and they are +/- 1 degree.The included main Hub/WiFi router is easy to set up and the instructions are well done and intuitive.

The Yolink X3 Outdoor Tempurature and Humidiity Sensor is perfect for my needs because, while outdoors, it's in a sheltered spot. The user manual says:"Direct intense sunlight, rain and snow over an extended period can discolor or damage the device. Consider placing the sensor where it has overhead cover and/or protection from the elements.Thermometers should never be in direct sunlight so that's OK. The warning about rain and snow could be a concern and is the reason I gave four stars rather than five. Other than that it uses Yolink's excellent LoRa wireless to connect to a Yolink hub, a necessary addition for Yolink systems. For my needs it's perfect.

I have purchased many of these YoLink products now because they are super easy to add to the controller, they always work right out of the box, and I have had no issues with them quitting or becoming unresponsive. I have one in my attic, one in the far back of the house measuring a hot tub temp, another under a deck in the back, and yet another INSIDE a freezer - none of them have transmission problems. Fantastic stuff.

These is a great system for remote monitoring. They work at a great distance too. I have one unit monitoring my well pump enclosure that's through the woods over 1000' feet away and it still has a strong signal. Alerts me when the temperature gets below freezing (or at whatever limit you choose). Also have one in the freezer so I know if there was a problem while I'm gone for extended periods.