WHITE FRONT/GRAY SIDES PRESTIGE 2-WIRE IAQ KIT WITH REDLINK TECHNOLOGY. RESIDENTIAL OR COMMERCIAL USE. 7 DAY PROGRAMMABLE. UP TO 4H/2C HEAT PUMP OR UP TO 3H/2C CONVENTIONAL. KIT CONTAINS THX9421R5021WG/U COLOR TOUCHS CREEN THERMOSTAT, THM5421R1021 EQUIPME