Product review (5 stars): Much easier and cheaper than a wi-if thermostat
Bought this instead of a "smart thermostat" to monitor the furnace while we are away in Florida.  It took two tries to integrate the unit with our wi-fi router and to get the transmitter to recognize the sensor but once online, it works exactly as advertised.  We can see the temperature in the house at all times and get alerts when the temp falls below our setting or when the unit is not transmitting.  The house must have lost internet and we got an alert.  It took a few hours for the unit to reboot but it did and resumed normal operation. It's definitely worth the price to know what's going on when you are gone for extended periods.