Standard Features - High-Definition, Full Color Display - Larger, full color display screen makes it easier to read - Interview-Based Programming - Asks you questions and then programs itself based on your answers - Connects to the Internet - Monitor and control your HVAC system over the Internet from a PC, smart phone or tablet (with Total Connect Comfort Services) - Displays Outdoor Temperature - Right on the home screen of the thermostat (with Wireless Outdoor Air Sensor) - Temperature Control Anywhere in the Home - Sense and make temperature adjustments from anywhere in the home (With Portable Comfort Control) - 7-Day Programming - Allows separate programming for each day of the week - Time-of-Use Scheduling - Automatically adjusts your home's temperature when utility prices are at their highest to help you save on energy costs - All-In-One Control - Controls temperature and Indoor Air Quality (IAQ products) such as humidification, dehumidication and air filtration all from a single control in the living space. - Tri-Lingual - Adjust settings to display in English, Spanish or French - Model Numbers: YTHX9321R5000, YTHX9321R5030, YTHX9321R5012, YTHX9321R5079, YTHX9321R5003, YTHX9321R5061, THX9421R5005, THX9421R5013 - 5-Year Warranty