The Honeywell T775-SENS-OAT/U is an outdoor air temperature sensor specifically designed for the T775 series controllers. With a resistance of 1097 ohms PTC at 77°F, this sensor provides accurate temperature readings essential for efficient HVAC operation. Its durable construction ensures reliable performance in various weather conditions, making it suitable for outdoor installations. The sensor is easy to install and integrates seamlessly with the T775 series, enhancing the overall functionality of the temperature control system.