Google Nest Thermostat - Smart Home Device - Programmable Wifi Thermostat In the box Specs Controller Type Google Assistant, Amazon Alexa, nest, iOS, Android Special Feature Programmable Specific instructions for use Heat Pump Connectivity Technology Bluetooth, Wi-Fi Voltage 24 Volts Control Method Voice Connectivity Protocol Wi-Fi Backlight Yes Number of Batteries 2 AAA batteries required. Screen 2.4 in (6 cm) color LCD 240x320 resolution Mirrored glass finish Compatibility The Nest Thermostat works with most 24V heating and cooling systems, including furnaces, air conditioners, boilers, and heat pumps with either forced air or radiant delivery. Heating and Cooling: 1 stage of heating (W1) and cooling (Y1) and a second stage of either heating (W2) or cooling (Y2). Heat pump: with auxiliary or emergency heat (O/B, AUX) Fan : (G) Power : (C, Rh or Rc) Professional installation is strongly recommended for dual fuel systems. Sensors Temperature Humidity Proximity (passive infrared sensor) Soli sensor for Motion Sense Capacitive touch Ambient light Memory 256 MB Size and weight Assembled (Display+Base) Mass: 4.9 oz (139 g) Diameter: 3.3 in (8.4 cm) Depth: 1.07 in (2.72 cm) Trim plate size Width: 7.09 in (180 mm) Height: 4.41 in (112 mm) Battery 2x AAA 1.5V alkaline batteries Power consumption Less than 1 kWh/month Voltage requirement 20-30V AC Connectivity requirements For remote control: Wi-Fi internet connection Google Home app Phone or tablet running iOS or Android Wireless 802.11 a/b/g/n (2.4GHz/5GHz) Wi-Fi 802.15.4 (2.4GHz) Bluetooth Low Energy Bandwidth Average bandwidth approximately: 50 MB/week upload and 50 MB/week download Certification UL 60730-1, Automatic Electrical Controls for Household and Similar Use UL 60730-2-9, Particular Requirements for Temperature Sensing Controls In the box Nest Thermostat display Nest Thermostat base Mounting screws and wire labels AAA backup batteries Quick start card Welcome Guide Operating Ambient: Temperature 32° to 104°F (0° to 40°C) Humidity Up to 90% RH unpackaged Pressure Up to 10,000 ft altitude Storage Ambient: Temperature -4° to 113°F (-20° to 45°C) Humidity Up to 80%RH in packaging Pressure Up to 15,000 ft altitude Green Contains no hazardous substances RoHS compliant REACH compliant ENERGY STAR® Recyclable packaging EU Persistent Organic Materials (EU POP) WEEE CEC Title 20 CEC Title 24 Residential Conflict Mineral Free Prop 65 Perchorlate Free Halogen Free Plastic components made with 49% post-consumer recycled materials