Thermostat's features include a floor sensor and/or air sensor that controls floor temperature; 15-amp capacity controlling up to 150 sq. ft. of 120-VAC mats or 300 sq. ft. of 240-VAC mats; built-in ground fault protection with no need for a separate GFCI (in most code areas); large, back-lit digital display; temperature range of 40° to 99°F; temperature display in °F or °C; on/off switch; 12 or 24-hr. clock.