WHITE FRONT/WHITE SIDES PRESTIGE 2-WIRE IAQ KIT WITH REDLINK TECHNOLOGY. RESIDENTIAL OR COMMERCIAL USE. 7 DAY PROGRAMMABLE. UP TO 4H/2C HEAT PUM P OR UP TO 3H/2C CONVENTIONAL. KIT CONTAINS THX9421R5021WW/U COLOR TOUCH SCREEN THERMOSTAT, THM5421R1021 EQUIP