The contractor did not set it up as programmable, so I did. This was buried in the contractor settings, not easily available to the homeowner. But , once I set it up, it works great from my phone and Apple Watch, as well as using Geo Fencing.
I tried a simple thermostat but I was told that one wouldn't work on my system. I bought a more complex thermostat and after starting realized the instructions said get professional assistance if you have this wiring. The T6 went in and worked.
Have only had it a short time. I'm happy with my purchase and would buy it again. They were installed by a contractor to be paired with two new AC systems, but I did the programming. Contractor recommended this model over Nest. Rather easy to use.