Product review (5 stars): Awesome product
I bought this system for my vacation home.  I am not there all the time and needed a system to monitor the internal temperature of my home -- in order to avoid possible water damage from frozen pipes, should the furnace stop working (which it did 2 years ago)  I have one sensor on each floor and it connects to my iPhone so I can monitor the temperature.  If the temperature gets lower than what I have the away temperature set for, I know it well in advance and can get someone out to the house to check things out before I get water damage from frozen pipes.  Very easy to install and program -- had no problem at all