100% fully functional Nest white 3rd generation thermostat. Purchased and professionally installed 4 years ago. We just had a new HVAC system installed and with that came a new thermostat system we had to install and use (Bryant Home), and I will say I can already tell it is not as good as the Nest. I LOVE the Nest and wish we could have kept it. Stored in our pet free and smoke free home.