Honeywell Interface Module for Wireless Focuspro Thermostat THM5320R1000 - 2H / 2C Conventional or 3H / 2C Heat PumpControls up to 3 heat / 2 cool heat pump systems or up to 2 heat / 2 cool conventional systems when used with the Wireless FocusPRO Thermostat. RedLINK Enabled. Product Specifications BRANDHoneywell WIDTH INCHES1-7/8 DEPTH INCHES1-7/8 HEIGHT INCHES8-1/8 COLORGray TEMPERATURE CONTROL RANGE °F-- VOLTAGE30 / 24 / 20 / 18 PROGRAMMABLE-- STAGES2H / 2C Conv or 3H / 2C Heat Pump APPLICATIONGas, Oil, Electric, Heat Pump, Forced Warm Air, Hot Water, Steam or Gravity DESCRIPTIONEquipment Interface Module for RedLink Thermostats FOR USE WITH2H / 2C Conventional or 3H / 2C Heat Pump System INCLUDESEquipment Interface Module LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERTHM5320R1000