Upgrade your home's heating and cooling system with the Google Nest Smart Thermostat 4th Generation. This programmable thermostat is compatible with Nest and can be controlled through the app or with voice commands using Google Home/Assistant or Amazon Alexa. The device features a 2.4-inch (6.1 cm) display and is wall-mounted for easy installation. The thermostat has a low voltage of 24 V and runs on corded electric and battery power with AAA batteries. It has temperature sensor technology and two cool stages to keep your home comfortable year-round. With Bluetooth and Wi-Fi connectivity, this thermostat is perfect for any smart home.