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 appearance. · 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 · ◦F/◦C selector |