The 2PK Honeywell Home Smart Room Sensor RCHTSENSOR-1PK is a white plastic sensor designed for use with Honeywell Home T9 and T10 Pro Smart Thermostats. It is powered by AAA batteries and operates wirelessly, with a range of up to 200 feet and the ability to detect motion. This sensor can be paired with multiple sensors for added convenience and is compatible with both the T9 and T10 Pro thermostat models. Ideal for wall-mounting, this sensor utilizes temperature sensor technology and features wireless connectivity for easy integration into your smart home system.