Monitor Any Room with Honeywell Smart Room Sensors You will prioritize living areas during the day and bedrooms at night for comfort where you like, when you need it, when you add Smart Room Sensors to your system. Smart Room Sensors are up to 200 ft. in range and have a battery life of 1 year. Practically mount smart sensors wherever you want. Multi-Room Focus and People Detection Honeywell Smart Room Sensors will know when a room is occupied by detecting people, automatically changing the temperature of the room when you enter. Smart Room Sensors can sense people when a room becomes occupied, automatically changing the temperature of the room when you enter. This set of two Honeywell Smart Room Sensors is compatible with the Honeywell Home T9 WIFI Smart Thermostat.