Mfr Part#: C7089B1000
Honeywell Outdoor Sensor (sku# C7089B1000) is a Remote Outdoor Sensor for Honeywell Chronotherm IV T8600 and T8500 Thermostat families and TZ-4 Zone Panel.
Honeywell outdoor sensor displays the current outdoor temperature. Also can be used to manage dual fuel and lock-out expensive auxiliary heat in heat pump applications.
Technical Specifications of Honeywell Outdoor Sensor (C7089B1000):