YDC MOST System Fiber Optic Loop Bypass MALE & FEMALE Plug Adapter Car Diagnostic Kit Optical Fiber Loop Male + Female Connector Compatible With Mercedes BMW. The MOST Diagnostic Kit to help you to quickly find the fault point, whether it is the problem of the motherboard transceiver, or cable connection problems. The optical fiber loop can remove or add a single vehicle equipment, and do not affect the car fiber-optic network. It also can diagnose and find fault point when a node in the MOST (Media Oriented Systems Transport). Bluetooth phone module was often damaged when opening stereo the sound intermittently, sometimes no sound, the fiber head of the phone module can be pulled out, connected to the fiber loop, deactivate the Bluetooth phone function, audio immediately return to normal. Fitment For: Suitable for all vehicles with MOST system. Package Included: 1x Male Connector 1x Female Connector