This package includes the KESSv2 MASTER hardware and TRUCK-AGRICULTURE Protocol activation. KESSv2 allows you to read and write to the ECU by connecting the tool to the diagnostic port using the supplied connector. The MASTER version allows you to read the stock ECU file unencrypted; then once you have modified the file, you can flash the file back to the ECU with automatic checksum correction. The MASTER hardware gives you the flexibility to manage your own files.Included with the hardware are the following: 144300K201 - KESSv2 Universal cable144300KCAN - KESSv2 OBDII cableUSB 2.0 cableAll tools include a 12 month subscription for FREE updates.