Item included: Optical Loop Connector x 2 (1xFemale Adapter+1xMale Adapter) Help you to quickly find the fault point, whether it is the problem of the motherboard transceiver, or cable connection problems. Optical fiber loop can remove or add a single vehicle equipment, and do not affect the car optical fiber network When a node in the MOST (Media Oriented Systems Transport), it also can diagnose and find fault point If you meet the faults of audio CD and navigation systems, audio CD don't work, navigation is often broken and always blank screen, it may be caused by damage of the telephone module. Please find the optical fiber head of telephone module and pull it out, and connect optical fiber loop to cancel the phone function, so that can resume work. The modules connected on a vehicle M.O.S.T ring include: CD Changer, Video Display, GPS Navigation, Mobile Phone, Bluetooth, Voice Recognition, Amplifier and Digital/FM/AM Tuner. If you wish to remove one of these modules from the fiber optic ring for repair or fault diagnosis you will require this female Tyco (TE) connector / adapter and fiber optic bypass loop cable to close the M.O.S.T ring and maintain the integrity of the remaining modules on the ring. It can also be used to diagnose faults by systematically removing modules from the ring and inserting this adapter loop to bypass the module.