YTHX9321R5003 HONEYWELL HD COLOR SYSTEM KIT PRESTIGE HD SYSTEM REDLINK ENABLED INCLUDES THE PORTABLE COMFORT CONTROL (REMOTE) + WIRELESS OUTDOOR TEMPERATURE SENSOR AND HIGH DEFINITION COLOR Large, easy-to-read backlit display; adjustablie backlight level Interview-Based Programming wizard to schedule thermostat temperatures and times USB Port, Real-Time Clock, Precise Temperature Control Multiple HOLD options to modify schedule, Change Reminders, RedLINK enabled Includes Portable Comfort Control, Wireless Outdoor Sensor and Prestige HD Thermostat