DO NOT GET THE M - POWERED crap they offer. . My mistake that I thought it was a great idea, save power,  money and have access on my smartphone. I was completely wrong.   \n* the guy that came in to install the thermostats walk into my brand new home, with his dirty shoes,  not even wearing those shoe covers.  3 weeks later my thermostat downstairs stop working but for some odd reason the fan was still on. To turn it off I had to turn off the power supply at the breaker box. I had 2 different guys come out and blame it on my BRAND NEW units.  Its ironic that my unit decided to have issues the same exact time their thermostat did. They kept insisting that I need to have an HVAC guy to come out, of course I would be responsible for paying whatever work they need to do... At the end of the day I wasted my time and my energy dealing with this M-POWERED crap. I had them remove both thermostat and now I need to hire an HVAC guy to fix their mess