Standard Features - One program for the weekdays; a separate program for Saturday and Sunday - (Up to 4 periods per day) - Easy to Use Straighforward display and buttons keep operation and programming simple - Backlit Display Easy to read, even in dimly lit rooms and hallways - Smart Response Technology Continually adjust the pre-heating/cooling of your home so you are comfortable at your programmed times - Auto change from heating to cooling - Compatible with heating and cooling plus heat pumps - Does not work with electric baseboard heat (120-240V) - Model Numbers RTH6450D - 1-Year Warranty