Equipment Interface Module controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system. Three sets of Universal IAQ contacts to control humidification, dehumidification and ventilation. Four sensor inputs for wired sensors or dry contact devices.

Honeywell Home 2-Wire IAQ Equipment Interface Module, 18-30 V, 50/60 Hz, 5 to 95 % Humidity Rating, Hardwired Supply, 3 Heat/2 Cool Conventional, 4 Heat/2 Cool Heat Pump Stages, -40 to 165 deg F, Gray, 9-5/16 in H x 4-13/16 in W x 1-5/8 in D, For Use With: All THX9421R5021 Prestige® 2-Wire IAQ Thermostat and all versions of Prestige® IAQ Thermostat and the VisionPRO® Thermostat with RedLINK™ Technology

• EQUIPMENT INTERFACE MODULE; PRESTIGE 2-WIRE IAQ THX9421R5021 THERMOSTAT, VISIONPRO THERMOSTAT; OVERALL DIMENSION 4-13/16 INCH WIDTH X 1-5/8 INCH DEPTH X 9-5/16 INCH HEIGHT; COLOR GRAY; VOLTAGE RATING 18 TO 30 VOLT AC 50/60 HERTZ