The COS-100HD-B HDMI Coaxial Cable Extender is a transmitter and receiver set for transmission of HDMI signals over a coaxial cable. Video signals are extended without first being converted into analog signals. The receiver supports Daisy Chain connection and bidirectional communication via RS-232C. The COS-100HD-B enables HDMI transmission over existing coaxial cables. You can select HDMI audio or analog audio input.