Stereo 3.5mm To Stereo 3.5mm Audio Balun Extender Over CAT5e CAT6 CAT7 Headphone Jack to 3.5mm Audio Balun Extender Over CAT5e CAT6 CAT7 Easy to install just plug it in - True plug and play Set of 2 Audio Baluns - 1 Receiver and 1 Transmitter Bi-directional so each end can either transmit or receive Maximum of 250 Ft cable length