Honeywell 99137 COMBO:(1) Outdoor Temperature Sensor, (1) C7189U1005 White Indoor Remote Temperature Sensor For Th7000 and Th8000 Thermostats
WHITE OUTDOOR TEMPERATURE SENSOR -4With the Honeywell Outdoor Temperature Sensor -4 you'll always know what the temperature is outside. Use it to arm your security alarm or adjust your home's heating...