The ecobee remote sensor module enables the user to connect up to 4 remote sensors to your ecobee Smart or ecobee EMS system. Sensors supported are Temperature Sensor (10K ohm, NTC, Type 2), Humidity Sensors (0-5 or 0-10VDC) & CO2 (0-5 or 0-10VDC) - EMS only.
The ecobee Smart or ecobee EMS system must be using software version 2.1 or later to support the EB-RSM module. If you are not running this version, please contact ecobee support to have your thermostat upgraded.
To verify the version you are running: From the Home screen, press More > Settings > About > Version
Operating Temp: -40 to 160F (-40C to 70C)
Operating Humidity: 5-95% R.H non-condensing