Standard Features - Easy to Use - Basic operation keeps programming simple - Backlit Display - Early Start Function Adjusts the pre-heating/cooling of your home so you are comfortable at your programmed times - Filter Change Reminder Keep your heating/cooling system operating at peak performance - Precise temperature control of +/-1F to maximize comfort - Display Options C or F temperature - 12 or 24 hour clock - Works with low volt heating/cooling systems including millivolt & heat pumps with or without auxiliary heat - Does not work with electric baseboard heat (120-240V) - 1 Year Limited Warranty