YoLink Smart Wireless Temperature & Humidity Sensor, Wide Temp Range (-22 to 158 Degree) for Freezer, Fridge, Green House, Pet Cage, Smartphone Alerts - Hub Required

Easier to set up than Samsung smartthings. Doesnt use wifi, instead LoRa which reduces load on router etc. Temp unit has been in our cryo freezer for months. Wanted to know how much i can reduce the fridge/freezer setting to stop paying for -15 freezer in a home kitchen. Signal can go through walls and the metal of a cooler or fridge.

You can look up the current reading from the always-on LCD panel on the 2.5”x2.25” sensor as well as from the phone app with up to one-hour delay. The phone reading is updated only once an hour. There is no refresh button for force reading the current temp/humidity. If the recent phone display says “Recently update:” 08:00 AM, then that is all you can see on the phone until 08:59 AM. At 09:00 AM, the phone reading is updated to the 09:00 AM reading. The graph reading lags even more. The app graph gets updated with a one-hour lag. E.g. at 8 AM, you see the 7 AM reading on the graph. But, at 8:59 AM, you still see the 7 AM reading. At 9 AM, the graph gets updated with the 8 AM reading. Why one-hour lag? I don’t see the data “refresh” button in the app. There is a “refresh” button on the “Rooms” screen, but that seems only usable for refreshing the list of devices connected to the hub. The graph data logging is only once an hour on the hour and you cannot change it. The app display choices are hourly or daily, and temp or humidity. You would expect to be able to change the range of display time. But no, pinching the screen does not change the magnification. You can only scroll endlessly left or right in fixed scale day or hour mode to see the time span of interest. I am not sure what the app designer was thinking. Like other YoLink devices, the batteries are pre-installed and shipped turned ON! Depending on how long the device sat in the inventory, you can be receiving already or mostly spent batteries only good for immediate recycling. The temp sensor firmware is 0309.

Im usually skeptical with low cost devices, but I was in a situation to see if I needed to buy a new fridge, but wanted to know what was going on with it since it was starting to give me issues. So I purchased the temp/humidity sensor. Let me tell you, this system is awesome! The set-up was amazingly easy, and it was true to its word that it has a long distance connection. I have the fridge on opposite ends of my 2k sq ft home. It goes through walls and sends a signal to the (dedicated, sold separately wifi base) and provides me with notifications on my cell phone as I pre-set the qualifying conditions in which to notify me. Ive been talking to my friends about this unit. Highly recommend it.

I have 7 of these that I use. All but one seem to function with good accuracy. I have one that seems to be off from other thermometers by almost 5 degrees at times. Overall a good product with pretty good reliability.

I ordered an additional temperature sensor as I have a few already and I am happy with them. I also have some water leak sensors. I was having a little trouble setting it up and contacted customer service and they walked me through it as they always do -I am very happy with the product and the service!

Ive had 4 moisture sensors in the attic now for over 2 years and 2 temp-humidity sensors. Due to house layout, I have 2 hubs. From day 1 the hubs would not connect to the WiFi. Fortunately I have two router satellite stations with RJ45 plugs. YoLink sent me a third hub over a year ago, but it failed to connect via WiFi as the original two did. Today I pulled the third hub out again (Dec 2022), just to see if something might have changed. No joy, so hub 3 goes back into storage. I continue to see hub connection issues on the Q&A which YoLink attributes to firewalls, user connections, etc. In other words, the problem is with the user. Im convinced the problem is with the YoLink design, which theyve been unable or unwilling to fix. Yes, Ive been in touch with tech support when I originally received the hubs. No joy. Other than the hub issue, the sensors work great, and actually detected an AC condensation leak earlier this year and sent me alarm notices. But dont plan on the hubs being connected to your house WiFi. Maybe they will, but if they wont like many of us, you will have to rely on hard cable connection for operations.

I was very surprised how easy this was to set up. It worked in honestly about 2 minutes. The long battery life is a huge plus, and its quite accurate after testing it against known conditions. About 10 minutes after opening the box Id already bought more. My only VERY small complaint is no dark-mode in the App. This works great with Google assistant. I use it so I can ask what the temp is outside and get a real answer, not one for my area code. It integrates into IFTTT quite nicely. The temperature sensors are -not- wifi connected, to be clear. The hub takes Ethernet or links to Wi-Fi, but, the sensors dont.

This sensor is affordable, easy to set up an has a incredibly long range including excellent wall and freezer door penetration. Customer service is quick and helpful. I have only one issue, which they have said they will fix in an upcoming release, which is that the alarm can not be used in a freezer scenario. As you see in the photo, all freezers are below temp threshold, so they would alarm continuously. They are reducing the lower limit to address this soon. In the future I hope they offer an even lower cost version without the LCD display which is very nice but useless when inside a freezer or other place I can’t see... I look forward to testing their other sensors soon.

These are a little complicated (for a simple mind like mine) to set up and get connected but overall, I like them and have ordered a couple more sensors since.

Used for bearded dragon tank