Generation: 3rd Generation;Color: Copper;Screen: 24-bit color LCD, 480 x 480 resolution at 229 pixels per inch (PPI), 2.08 in (5.3 cm) diameter;Languages: English (US, UK), Dutch, French (Canada, France), Italian, Spanish (Americas, Spain);Compatibility: 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;Heat pump: With auxiliary and emergency heat (O/B, AUX, E);Cooling: 1 and 2 stages (Y1, Y2);Heating: 1,2, and 3 stages (W1, W2, W3);Sensors: Temperature, Humidity, Near-field activity, Far-field activity, Ambient light;Wireless: Wi-Fi 802.11b/g/n @ 2.4GHz, 5GHz, 802.15.4 @ 2.4GHz, Bluetooth Low Energy (BLE);Battery: Built-in rechargeable lithium-ion battery;Power consumption: Less than 1 kWh/month;Remote control requirements: Wi-Fi connection with internet access, Nest app on phone or tablet with Android or iOS, Latest version of Safari, Chrome, Firefox or Internet Explorer on Mac OS X v10.9 or later and Windows 7 or later;Certification: ENERGY STAR