New and unused. The Extron DTP HD DA4 4K 330 and DTP HD DA8 4K 330 are distribution amplifiers that provide one HDMI input with loop-through, and either four or eight DTP® outputs. Each twisted pair output sends HDMI, audio, and control up to 330 feet (100 meters) over shielded CATx cable to Extron DTP‑enabled products. The DTP HD DA 4K 330 accepts analog stereo audio signals for simultaneous transmission over the same shielded CATx cable. It supports video signals at resolutions up to 4K.