Smart Wireless Temperature/Humidity Sensor Wide Range for Freezer Fridge Monitoring Pet Cage/Tank Monitoring, App Alerts, Text/SMS, Email Alerts, Compatible with Alexa IFTTT, 2 Pack - Hub Included

Setup:Setup could not be easier.1. Install app,2. setup hub3. add sensor(s).4. Update Firmware.To make the hub setup quick and easy it's best to connect the hub to your router with an ethernet cable. The instructions have you scan a barcode on the hub using the app to register it, then power it up. It came online within a few seconds. WiFi can then be setup while it is connected via ethernet cable. If you wish to use WiFi power off and relocate the hub. It takes about 30 seconds to join WiFi after being powered up.Adding the sensor(s) is similar. Scan the barcode on the device with the app, then turn it on using a switch on the back of the unit. It will connect to the hub quickly. It is best to configure all the alerts and other settings while you have the sensor on a desk, then when the configuration is complete place the sensor where it is needed.Both the hub and sensor had the latest firmware as delivered which is awesome.Use:The LCD's still work even at freezer temperatures of -5f. The batteries in the LCD sensors will not last very long in a freezer. maybe 9 months, I have ordered some sensors that do not have an LCD and come with Lithium batteries good for 5 years.I'm really impressed how well the sensors work inside a freezer clear the other side of the house from the hub. It lives up to the hype. Sensors contact the hub about once per minute.App:The app is very good, there are some really detailed statistics you can view and there is an option to download data. I have included a screen shot of one of the charts showing a 24 hour view,Alerts:After setting thresholds, alerts can be sent via the app on your phone, an email, or SMS. SMS is limited to 15 SMS's per month but email works just fine and has no limit.Yolink Eco system:The number and variety of devices you can add to the hub is impressive. Given how easily the system and app works I'll be adding devices in the future.Highly recommended.

This thing ROCKS. It’s unusual for a product like this to have an excellent app, and I was so impressed by the functional and intuitive interface. The app lets you set an acceptable temperature range, and if the temperature goes out of that range, it sends an alert/text/email. And at any time, I can see the real-time temp (and humidity) from my phone. I honestly didn’t expect this much value when I purchased it, and would have happily paid twice as much for it if I had known just how good it was going to be.

I was looking for something to monitor the temps of the refrigerator and freezers following a 12 hour power outage. Obviously I needed something which didn't require opening the fridge door. (My modem and router are on UPS's.) Also, another friend was gone for 4 days and his main refrigerator stopped working. The ice melted, the freezer contents melted and he had to move out of his house for the repairs.I found these YoLink products and thought I'd give them a try because their claim is a longer range (even through things like metal refers and freezers), WAY more range than typical devices, and minimal battery usage.They're are RIGHT! These things work through my metal refrigerators and through the metal on the chest freezer. I now have accurate reporting AND the ability to set parameters for alerts.In digging more into YoLink, I found they are a US based company. They also have home automation devices that also share long range connections.I have many home automation devices on my SmartThings hub (Zigbee and Z Wave). I bought a few YoLink outlets to see how they performed.I had connectivity to the YoLink outlets over 800' away in our barn!! They didn't quite reach the street 1400' away though. I'd love to have full automation all the way to the street for holiday decorations and more. I found YoLink can have more than one hub on the same network so I bought a hub for my barn. Bam! Works!! (The barn has a long range WiFi antenna which picks up the house's WiFi.)This is a brief recap. Hope it helps. Their devices are less expensive versus Zigbee or Z Wave devices. Although I have not dug into elaborate programming yet (like doing things when you arrive home or leave or temp/weather related automations), it appears this cold be a viable, better and cheaper replacement for ZigBee and Z Wave automation devices.Hope this helps everyone!

This system really works! I had some temperature sensors in my freezers that were linked to a display but they didn't work very well and weren't wireless. Also the display was upstairs and the freezers downstairs. Other wireless freezer monitors have a wire that connects the sensor to the battery transmitter that has to be placed outside of the freezer. As a result the wire has to go thru the freezer seal. Did like that since I don't want anything affecting the seal. The YoLink system sensors have a digital readout and are placed in the freezer. No interruption of the seal. They also have a display in each of the sensor so I know how cold the unit is.Got two YoLink sensors and a hub. Plugged the hub into my hardwired ethernet router node added it followed by the two sensors. Easy!!!! YoLink is capable of easily transmitting through the freezers and I can monitor it on the iphone app and have warnings set to advise me wherever I am by message and email if any problems devlop.This system works great and I intend on getting the leak detectors next.