ThunderMax Serial Port Style Communication Cable, 6 Foot Fits ThunderMax Generation I & Generation II modules: #309-340, #309-360, #309-364, #309-365, #309-366 and #309-385 Available in Standard 6 Foot and Extended Length 12 Foot If your laptop or PC does not have a serial port, you will need to purchase a Serial Port Adapter for ThunderMax modules (#372-002)