Nest Thermostat E pro in white color, is rated at 24-Volts and can be easily controlled with a spin dial that wraps around the device. This thermostat E pro can be controlled by voice with Google home or Amazon Alexa. It has 24-bit color LCD with 320 x 320 resolution. Thermostat E pro uses sensors for monitoring temperature, humidity, proximity/occupancy and ambient light. Thermostat E pro supports Wi-Fi internet connection, Phone or tablet running iOS or Android OS and Nest app. The Nest app learns user habit for controlling temperature automatically and then program itself to suit lifestyle. It supports 802.11b/g/n 2.4 GHz, 802.11a/n 5 GHz, 802.15.4 at 2.4 GHz and Bluetooth wireless technology. It has a dimension of 3.19-Inch Dia x 1.14-Inch. Thermostat E pro withstands a temperature range of 32 to 104 deg F. It has built-in rechargeable lithium-ion battery. Push-pin mountable thermostat E pro is used with 85% of 24-Volt heating and cooling systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar and geothermal. It includes battery, display, base, optional trim plate, mounting screws and labels, installation guide and pro installation card. Thermostat e pro is UL listed, RoHS/REACH compliant and Energy Star qualified. It supports 802.11b/g/n 2.4GHz, 802.11a/n 5GHz and 802.15.4 @ 2.4GHz wireless.