The ecobee wireless Smart Sensor for Doors & Windows 2 Pack in White is a set of door sensors that operate on battery power. These sensors are compatible with various smart home systems such as Apple HomeKit, Google Assistant, and Amazon Alexa, allowing for convenient control and monitoring of your home environment. With features like energy savings, programmability, automatic motion tracking, and instant alerts, these sensors provide enhanced security and peace of mind for your home. Easy to install and programm, these ecobee sensors are a reliable addition to any indoor surveillance system.