1. Reason for use: Many old - style cars commonly use the Media Oriented Systems Transport (MOST) system. Since the modules of this system are connected in series during the maintenance process, when a Media Oriented Systems Transport module malfunctions, it may cause the entire system to fail. In this case, the modules can be replaced in series to determine and confirm the working status. 2. Use: If there are malfunctions in the audio CD and navigation system, such as the audio CD not working, the navigation often crashing, and the screen always being blank, it may damage the phone module. The modules connected to the vehicle's Media Oriented Systems Transport ring are: CD changer, video display, GPS navigation, and phone. When removing one of the modules from the fiber - optic ring for maintenance or troubleshooting, this connector/adapter and the fiber - optic bypass loop cable are required to close the Media Oriented Systems Transport ring and maintain the integrity of the remaining modules. 3. Specifications of the connector: - Male connector length: 118 mm, 4.65 x 1.69 x 0.51 inches (length x width x height). - Number of pins: 2. - Female connector size: 35x25 mm/1.38x0.98 inches (length x width). - Male connector size: 27x25 mm/1.06x0.98 inches (length x width). 4. Compatibility: Suitable for cars. 5. Color: Black. 6. Material: Plastic. 7. Packaging contents: 1 set of fiber - optic loop bypass connector. The above is only the packaging content and does not include other products. 8. Note: Due to differences in lighting and screen displays, the color of the item in the picture may slightly differ from the actual product. The allowable measurement error is +/- 1 - 3 cm.