The Venstar ACC0400 can be used as an indoor or outdoor sensor for many of the Venstar Thermostats
The outdoor air sensor allows the outdoor air temperature to be sent to the thermostat. It can be used with the T1100FS, T1700, T1800, T1900, T2700, T2800, T2900 or TSTATEZ thermostats. The high and low outdoor air readouts for the day can be displayed on the T1800, T1900, T2800 and T2900 thermostats. When used as remote room sensor, the accessory can be used with the Venstar T1900, T2700, T2900 and T2900SCH thermostats. The sensor may sense room temperature where it is installed. The thermostat will control to the remote temperature sensor reading and show a blinking degree icon next to the temperature display on the thermostat.