The two units are attached with an HDMI cable, which is included with the tuner. The tuner allows the HDTV to be connected to devices with different broadcasting systems, such as HD digital terrestrial and cable. The JVC TU-CX100 is NTCS, ATCS/ QAM compatible and has two HDMI inputs with CEC, one HDMI output, one USB 2.0 input, one component (composite) input, one SPDIF optical digital audio output and a composite/AV output.