Check the listing for details. Pro1 IAQ R251S Wired Indoor Sensor with Up to 300ft Range. Condition: New. Listed at 48.87 USD. Electrical HVAC Thermostats Thermostat Wire Tools Plumbing R251S - Pro1 IAQ wired indoor remote sensor. Dimensions: 2.75"H x 1.5"W x .75"D Resistance range up to 300 feet with operating temperature of 32 degrees F to 105 degrees F. Product Details Color Height Length UPC 662766483482 HVACSurplus.com works with a wide variety of brands that you know & trust. Some of our brands include: Aprilaire ∙ Belimo ∙ Braeburn ∙ CPS Products ∙ DiversiTech ∙ Ecobee ∙ Emerson ∙ Functional Devices ∙ GeneralAire ∙ Honeywell ∙ ICM Controls ∙ iO HVAC Controls ∙ Jackson Systems ∙ Johnson Controls ∙ Kidde ∙ LeakSmart ∙ Little Giant ∙ Lux ∙ Malco ∙ MA-Line ∙ NAVAC ∙ Nest ∙ Packard ∙ Peco ∙ Pro1 IAQ ∙ Ranco ∙ Rectorseal ∙ Resideo ∙ Ring ∙ Robertshaw ∙ SolderWeld ∙ Skytech ∙ Supco ∙ UEI Test Instruments ∙ Universal Secruity Instruments ∙ Vents US ∙ White-Rodgers