This product is a brand cable of fault diagnostic tool. It is used for GM vehicles and its GM 12 pins allows you to connect a GM vehicle with a OBD1 12 pins socket with your existing OBD2 16 pins tool. And please note that this item is just a cable, not a scanner or diagnostic tool. Features: 1. Just usesd for GM vehicles. 2. The GM 12 pin adapter allows you to connect a GM vehicle with a OBD1 12 pins socket with your existing 16 pins OBD2 tool. 3. Utilized eco-friendly materials, reduce environmental pollution. Specifications: Type: Cables, adapters & sockets Connector: GM 12 pins male connector OBDII 16pins female connector Car Maker: For GM Item Length: Approx. 41.5cm / 16.3in Package Weight: 102g Package Included: 1 x GM 12-Pin to OBDII 16-Pin Cable Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. This item is just an adapter, not a scanner. 4. Please note that the type and old type of this product will be sent randomly, and make sure you will not mind before ordering