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

These work great. Have one sensor in the garage and one sensor in the basement and the base unit upstairs. The signal is strong for both sensors. The announcements are loud and clear from the base unit and the email and text messages to my phone are instantaneous with the announcement. The app info works great from anywhere. Great product.

The hub is an absolute pig to set up but once you have done then it’s a great piece of kit for ensuring that I’m notified if the freezer out in the garage fails. I’m using the other sensor to keep an eye on the temperature in the freezer in the house. * important to note that it will initially tell you that no internet has been found - just ignore it and carry on with the set up*

3 Temp sensors installed, 2 in freezers and 1 in fridge ,set temp limits, set alarm low/ high, hey presto alarm speaks through hub + app notification, lora much better than WiFi. Best thing purchased for a long time. 😃

works intermittently

Bought this to use in my freezer as an early warning system for loss of power or a freezer failure. It was simple to install and integrate with the free app. You can setup alerts to send email or SMS messages if the temperature goes above or below the thresholds you set. It also records the data so you can see over time how the temperature fluctuates which was interesting to see how much the temperature changes just by opening the freezer door for just a few seconds.