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Affordable thermostat for low voltage control of single-stage heating, cooling or heating-cooling systems. Familiar round appearance - simply twist the dial to desired temperature. Includes 5 1/2" optional wall plate. Features push-button light. The ES100 digital thermostat is designed to work on the following 24V systems. This thermostat will not control multistage heat pump systems or 120V line voltage heating systems. Suitable for: Gas - standing pilot Gas - Electronic ignition Gas - Fired Boilers Oil - Fired Boilers Oil - Fired Furnace Single Stage Heat Pumps with no Auxiliary Heat Electric Air Conditioning Specifications: Setpoint Range: 41-90 degrees F Terminals: RH, RC, W, Y, G,B, O Power: 2 AAA Alkaline Batteries (included) Thermostat Dimensions: 3 5/8" Round, 1 3/4" Deep. System switch positions - HEAT / OFF / COOL Fan switch positions - AUTO / FAN ON