1.5-2 DAY PROGRAMMING: Separate programs for the weekdays and weekends with 4 program periods per day including wake, leave, arrive and sleep 2.PRECISE TEMPERATURE CONTROL: Precise temperature control of plus/- 1 degree Fahrenheit. Temperature range limits allow you to set minimum cooling and maximum heating temperatures 3.DIGITAL DISPLAY: The display panel is backlit with an intuitive interface for one-touch access to setpoint temperature 4.EASY INSTALLATION: Easy to install yourself and works with many heating/cooling systems, plus heat pumps without auxiliary heat 5.REMINDERS: Built-in battery change and filter change reminders 6.RETAINS PROGRAMMING: Retains programmed memory in event of power outage 7.COMPATIBLE WITH: Gas, oil or electric furnace, Central air conditioner, Hot water system with or without pump, Millivolt system, Central heating and cooling system, Heat pump without auxiliary/backup heat.