This locking adapter is for use with Detroit Diesel marine applications. This is the cable for the Nexiq USB Link 2 so that you can connect to DDEC marine applications. Cables from the original Nexiq USB Link do not connect to the Nexiq USB Link 2. It is also for use with both the Nexiq USB Link 2 Wi-Fi Edition (Part #124023). This is a genuine cable manufactured by Nexiq.