Robertshaw 10-529 Remote Outdoor Temperature Sensor is used with the SlimLine Series (300-#) Robertshaw thermostats. The sensor will sense outdoor air temperature and send the information to the thermostat. The outdoor temperature will be displayed below the room temperature. Maximum Distance from Thermostat: 300 Recommended Wire: 22AWG Minimum, sheilded or non-shielded 2 conductor twisted pair. (cable length of probe: 6ft) Specifications -Power Supply: 12 to 30 VAC or DC (24V Nominal) -Probe Operating Temp: -40o to 50oC -Sensor Box Operating Temp: 0o to 50oC -Sensor Box Max RH: 90% (noncondensing) -Accuracy: +/-2o from -20o to 30oC after 30 minutes of continuous operation -Max Measurement Range: -48o to 47oC