This jumper module is used with our SignaLink USB p/n SLUSBHTY, SLUSBVXY, SLUSB847 and SLUSB705. It is also used with our radio cable p/n SLCABHTY, SLCABVXY, SLCAB847 and SLCAB705. This jumper module has a built-in capacitor and resistor as required by some HTs and other radios.