Honeywell Conventional 7-Day Electronic Programmable Thermostat. Universal Thermostat: Conventional & Heat Pump compatible; Adaptive intelligent recovery (Smart Response); Menu-Driven Programming; Easy to read back-lit display (on demand); Filter Change reminder & Low Battery Indicator; Armchair programming; Four daily periods, Precise temperature control (+/- 1 F). 7-Day Programming - Allows separate programming for each day. Energy Savings - Program to save up to 33 percent on annual heating and cooling costs (If used as directed. Savings may vary depending on geographic region and usage). Easy-to-Use - Straight forward display and buttons keeps operation and programming simple. Backlit Display - Easy-to-read, even in dimly lit rooms and hallways. Smart Response Technology - Continually adjust the pre-heating/cooling of your home so you are comfortable at your programmed times. Auto Change from Heat to Cool - Automatically adjusts the pre-heating/cooling of your home so you are comfortable at your programmed times. Selectable temperature range stops. Filter Change Reminder - Keeps your heating/cooling system operating at peak performance. Permanent Day and Time - Your settings are always maintained; even during a power outage. Daylight Saving Time (optional) - Adjusts the time automatically. Compatible - With heating and cooling plus heat pump systems. Does not work with electric baseboard heat (120-240V). 1 Year Limited Warranty.