Standard Features - Program each day differently Up to 4 periods per day - Easy to Use Basic operation keeps programming simpley - Backlit Display Easy to read, even in dimly lit rooms and hallwaysy - Early Start Function Adjusts the pre-heating/cooling of your home so you are comfortable at your programmed timesy - Precise temperature control of +/-1 F to maximize comfort.y - Display Options C or F temperature 12 or 24 hour clocky - Compatible with heating and cooling plus heat pump systemsy - Does not work with electric baseboard heat (120-240V) and multi-stage heating/cooling systemsy - Model: RTH2510By - 1 Year Limited Warranty