Standard Features - Weekday/Weekend programming One program for the weekdays and a separate for the weekend with 4 program periods per day - Easy to Use Basic operation keeps programming easy - Precise temperature control of +/-1 F to maximize comfort - Display Options C or F temperature 12 or 24 hour clock - Compatible with heating and cooling systems plus heat pumps without auxilary heat - Does not work with heat pump systems with back-up heat, multi-stage heating/cooling systems or electric baseboard heat (120-240V) - Model RTHL2310B - 1-Year warranty