Robertshaw 10-528 Remote Indoor Temperature Sensor is used with the SlimLine Series (300-#) Robertshaw thermostats. The sensor will sense air temperature at a remote location and send this information by digital communications back to the thermostat. Up to 6 sensors can be connected together to provide temperature averaging. 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) -Sensor Box Operating Temp: 0o to 50oC -Sensor Box Max RH: 90% (noncondensing) -Accuracy: +/-1o from -15o to 30oC after 30 minutes of continuous operation -Max Measurement Range: 0o to 48oC