ecobee Switch+ comes with occupancy, daylight and temperature sensors. Occupancy sensors detect whether anyone’s in the room. Daylight sensors detect the amount of ambient light in the room. Together, they work to ensure your lights turn on when you need them (like when you walk into a dark room) and off when you want (15 mins after you leave a room).
Switch+ also has a built-in temperature sensor which will work with ecobee Smart Thermostats to keep your rooms at your desired temperature (coming soon).