USB to Serial Adapter - TunerStudio. This USB to Serial Adapter has been tested and works properly with all versions of TunerStudio. We highly recommend this adapter is used if your tuning PC\/laptop doesn't have a DB9 Serial connector. Or you can use another adapter with a genuine FTDI chipset (which this uses).\n\nThis adapter includes a 2 foot\u00a0extension cable, but we only recommend using the extension cable if you have vibration issues with the adapter plugged directly into your laptop. USB cable runs are more susceptible to noise than RS232, so we recommend using our standard 6 foot\u00a0tuning cable in combination with this adapter\nDetails:\nUSB to Serial Adapter\nAdapter includes a 2 foot extension cable