iO HVAC Controls UT-SWM Universal Thermostat Smart Wire Module, 2-5 Wire Adapter

Supports both heat pump and conventional HVAC systems. Includes compact sender module and relay receiver module. Allows up to five digital outputs to be sent on the 24 volt signal wires. Power Consumption: 0.15mA (No Relays), 0.45mA (All Relays On).