This 9 pin J1939 to 16 pin OBD2 adapter cable is a heavy-duty truck's diagnostic service tool. It is compatible with various vehicle types, including heavy-duty and commercial trucks. The adapter has a female pin count of 16 and is designed for use with OBD2 devices. The adapter is manufactured by GENSSI and comes with a lifetime warranty. It has a length of 12 inches and is designed for use with a 9-pin J1939 connector. This adapter is an essential tool for diagnosing and troubleshooting issues in heavy-duty trucks.