Features:Latching relays for system compatibility Selectable applications satisfy personal demand AC24V with battery backup brings more safety, hidden batteries installation gives a clear and smooth apperance. High reliable stand-alone microprocessor increases anti-jamming ability 5+2 or 7 days 4 periods Programmable Low battery indicator(optional) Adjustable cycle rate 12/24 hour clock Large,easy-to-read LCD display with green backlight Easy,front load battery access Armchair programming allows you to remove the thermostat from the wall for programming Soft touch keypad Filter change indicator / selectorMain Functions Room Temperature Setting Detect and Display Room Temp Cool/Heat/Auto mode selectable / selectable indicator 12/24 hours clock Compressor short-cycle protection High/low temperature protection Selectable deadband setting Non-volatile memory 5+2 or 7 days 4 periods Programmable