Visit Amazon sites : br ThunderMax Serial Port Style Communication Cable 6 Footbr br Fits ThunderMax Generation I Generation II modules 309-340 309-360 309-364 309-365 309-366 and 309-385 br Available in Standard 6 Foot and Extended Length 12 Foot br If your laptop or PC does not have a serial port you will need to purchase a Serial Port Adapter for ThunderMax modules 372-000