Description Honeywell's C7189R1004 Wireless Indoor Air Sensor. RedLINK⢠enabled. Senses indoor temperature and humidity to be used for control with Prestige 2.0 and Prestige IAQ 2.0 Thermostats And Vision Pro 8000 Thermostats. The Wireless Indoor Sensor(s) is used to change the sensing location of the thermostat.