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

The UT-SWM, Universal Thermostat Smart Wire Module is an innovative and low-cost solution for any application where you need to control up to five (voltage free) digital outputs and only have a single pair of wires between two locations such as a thermostat and HVAC system. Features: Reduces installation costs by not having to pull additional wire Allows up to five digital outputs to be sent on the 24 volt signal wires Supports both heat pump and conventional HVAC systems Compatible with virtually all major thermostat brands Includes compact sender module and relay receiver module 1 year warranty