This cable is for Yaesu FT-100, 100D, 450, 817, 857 & 897 radios. It provides fixed level audio from the Data Port of these radios to the Sound Card of the computer for applications such as The EchoLink System^®, EchoStation, PSK31, SSTV, MFSK, RTTY(AFSK), Packet, WSJT and other soundcard digital modes.