The Ecobee Smart Sensor 2 Pack is a wireless, battery-operated device designed for smart home compatibility with various platforms like Apple HomeKit, Google Home/Assistant, and Amazon Alexa. This sensor features 3.5-inch display, 2 heat stages, and 2 cool stages, making it suitable for both heating and cooling systems. With a manufacturer warranty of 3 years and a sleek white design, this ecobee SmartSensor is a reliable and convenient addition to any home looking to improve comfort, security, and energy savings.