Non-Programmable Thermostat For House, Digital, Lcd White Backlit Screen ?Buyer's Note?Before making a purchase, please ensure that the image and product description match your existing thermostat (verify that the base supports only 2 to 5 wires), and check the dimensions to confirm whether it will cover any wall marks left by the old thermostat. ?Compatible System?For with Single-Stage Heating and Cooling, Gas Fireplace (24 Volts), Furnace Forced-Air Heating Only, Cooling Only, 750 Millivolt, Boiler Radiant Heating Only, Only Heat Pump (without aux) Systems. ?Incompatible System?Does Not Work Multistage Heating and Cooling, Heat Pump (with Auxiliary or Emergency Heat) Systems, Dual Fuel / Hybrid Heating, Mini Split Heat Pump Systems, RV Thermostat, Electric Baseboard Heat ( 120-240 Volts) and Line Voltage, Convectors, Radiant Ceiling Heat. Aowel non programmable thermostat for house up to 1 heating and 1 cooling single stage heating and cooling systems. Simple thermostat, Support separate heat or cool swing setting (range: 0.2F to 2F), giving you even greater control over your home temperature. Accurate temperature control of +/-2-degree F for consistent comfort.?Room temperature display range: 32F to 99F, temperature control range: 44F to 90F? Support temperature display calibration, Convert C/F units, compressor delay protection (selectable on or off). with humidity monitor and battery replacement reminder. Dual powered by 24VAC power or 2 AAA batteries, No common wire (c-wire) required on most systems. Easy-to see and read, with white backlight, large clear backlit digital display, very suitable for middle-aged and elderly people. Friendly Service: 2-year worry-free warranty and 24h customer service.