The big advantage of that is it won't drain your phone battery or data usage as it's self contained.I could see that device extremely useful if you had a business fleet.Thanks for the tip!

Aloha,Assuming you have some type of alarm system in the property, you should fairly easily be able to come up with a temperature alarm that could reside IN the refrigerator, and communicate with the alarm panel via battery wireless.

Alternatively, since electrical service isn't available, you could use a cellular, battery powered mobile hotspot with Blink cameras, provided the hotspot could be protected from theft.Scott

Toyota announced their intention to build a large plant in Liberty, NC. The location is called the Greensboro-Randolph Megasite. This site location, per the coordinates on the GRM website, is near Greensboro (central ...

It is not the most cost effective, but they have remote wireless signals (no need for internet connection) with battery backups and remote viewing capabilities. 

Also, the batteries have to be changed about once a month.  

No but I bought batteries... lots of batteries.  

And even if they took down the smoke detectors or failed to replace batteries that liability is going to be on you. 

At speed you don't need to know your battery condition, for example.Fast or slow, you gotta know.

The Triad is was recently announced to land Toyota's 1st lithium battery plant in North America which is one of many dozens of companies moving to North Carolina.