Amazon Product Link: https://amzn.to/2RwJKqI
Seeing that Amazon only allow one use of a code, I got a second code you can also use!!!
25% OFF CODE 1: P7385444 (Good until July 21, 2019) 25% OFF CODE #2: C6XCA8JB (Good until July 31, 2019)

Check out the Govee WiFi enabled Temperature and Humidity Monitor that will send you push notices ALERTS to your phone with NO monthly fee! Keep track of the temp in your RV or coach to protect your pets or other areas! When I told them I was going to make a video on it they offered a 25% off code to our subscribers so that is a nice bonus for you all. (Use the code at CHECK OUT.)

Some Notes...
I can't speak yet to a LOW BATTERY ALERT, but I can say it DOES ALERT you if the server does not hear from the unit in X amount of time and tells you to check the unit. I THINK it was within an hour when I and Brenda got an alert to check it after I pulled the battery out. As far as how long it will run, not sure on that either yet. :) However, it is good to note that it does not stay connected to WiFi all the time, it wakes up connects, sends the data, and goes to sleep. That is unless it hits your setting then it wakes up and sends right away. So if you tell it to send data every 10 mins vs every 30 mins, well, the batteries will not last as long as it needs to wake and and send more often. So seeing it has two settings, I would also have to assume that it would take longer for the server to report it has not seen the unit in some time if set to 30 mins vs 10 mins. I for one don't need 10 min reports and would rather have the battery life. As such, I run it at 30 mins. Remember, even at 30, you will still be alerted right away when it goes above your preset temp.

Note that is you have it set for every 10 mins, the server will alert you sooner if it does not hear from it as it expects it every 10 mins. So that would mean that if you have it set for 30 mins that it would be longer before you are notified to check the unit as it will need to wait until it missed the call in window X amount of times. (Hope that makes sense.)