Honeywell Home RTH221B1039 1-Week Programmable Thermostat

ONE WEEK PROGRAMMING: Set one program for the entire week with four program periods per day including wake, leave, arrive and sleep PRECISE TEMPERATURE CONTROL: Precise temperature control of +/- 1 degree Fahrenheit DIGITAL DISPLAY: Easy-to-read digital display with an intuitive interface for one-touch access to setpoint temperature EASY INSTALLATION: Easy to install yourself and basic operation keeps programming simple REMINDERS: Built-in battery change reminders.SET POINT RETENTION: Set point is retained in memory in the event of a power outage.DISPLAY OPTIONS: Fahrenheit or Celsius; 12 or 24 hour clock.OVERRIDE OPTIONS: Permanent and temporary override capability.COMPATIBLE WITH: Heating, cooling and heat pumps without auxiliary heat options.Does NOT work with electric baseboard heat (120-240 V), heat pumps with backup, or multi-stage heating/cooling