it is OBD-II to RS232 cable for ISO 9141-2

pyOBD (aka pyOBD-II or pyOBD2) is an OBD-II compliant car diagnostic tool. It is designed to interface with low-cost ELM 32x OBD-II diagnostic interfaces such as ELM-USB. It will basically allow you to talk to your car s ECU,... display fault codes,