PT: This unit sends line level stereo audio signals from the unit to Pads™ hub on category 5 wires. It is the ideal unit for retro-fit into a home with pre-existing structured wiring.

PTI: This unit is similar to PT, but adds IR emitter output for source equipment control

PTW: This unit sends line level audio signals from the wall-plate to the PADS™ hub on category 5 wire

PTWI: This unit is similar to PTW, but adds IR emitter output for source equipment control