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Pro1IAQ Model Wireless Wire - The WW160W "Wireless Wire" functionally replaces 24V thermostat wiring. Great for many applications - use instead of running wires when you need to: Make any thermostat wireless (up to 2H/2C Conventional or 3H/2C heat pump) Add wires to condensing unit Add wires when upgrading to multistage system Add wires anywhere wiring is difficult To use the wireless wire- simply connect the terminals on one module and when those terminals see 24V - the same terminals on the other module closes. You must have 24VAC power for both modules. Module dimensions approximately 4.25" H X 4.5" W X 1-1/8" D. Wireless Wire includes one input module and one output module.