It uses the tactrix cable to log data from your ECU port. It also allows you to integrate data from your WBO2 with the data from your ECU port. It costs $25. It is a one time fee that entitles you to later updates of the software. It is very user friendly and easy to set-up. After you purchase, download and install EVOScan, you’ll need to add my custom 3000GT log file. NO other logging program available will support my patched ROM.