Google Nest 3rd Generation Learning Smart WiFi Thermostat App Programmable Polished Steel color Great used condition, works nice! scratches on body and screen, 60 days seller warranty What is in the box:Nest Learning Thermostat display, 3rd generationScrewNest Thermostat baseNot include: Trim plate, steel plate, nest screwdriver, installation guide or welcome guideno box, no accessories. Compatibility:Google Nest thermostats are designed to work with most 24 V systems, even older systems. They work with all common fuel types including natural gas, oil, and electricity. The Nest Learning Thermostat works with 95% of 24V heating and cooling systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar, and geothermal.Heating: 1,2, and 3 stages (W1, W2, W3)Cooling: 1 and 2 stages (Y1, Y2)Heat pump: with auxiliary and emergency heat (O/B, AUX, E)Humidifier or dehumidifier (HUM, DEHUM)Fan (G)Power (C, RH, RC) We offer no hassle return service, if you are not satisfied with our item, please start a return process if you like, we will follow it immediately. If you like a replacement, please purchase another one after you return the defective one. Thank you!