Stable characteristics, high reliability. The MOST Diagnostic Kit helps quickly identify fault points, whether related to the motherboard transceiver or cable connection issues. The optical fiber loop allows removal or addition of a single vehicle equipment without affecting the car's fiber-optic network. It can diagnose and locate faults in a node within the MOST (Media Oriented Systems Transport) network. Bluetooth phone modules are often damaged when opening the stereo, causing intermittent sound or no sound. By disconnecting the fiber head of the phone module and connecting it to the fiber loop, the Bluetooth phone function is deactivated and o returns to normal immediately. Fitment for: Attenuation: less than 180 dB/km Working temperature: -55°C to +85°C Color: black Material: plastic Size: 115 cm x 25 cm x 12 cm (L x W x H) Core diameter: 10 Finished product diameter: 23 x 2 Package Contents: 1 x Male Connector 1 x Female Connector Only the above package content is included; other products are not included. Note: Light and different displays may cause the color of the item in the picture to differ slightly from the actual product. Measurement error allowance is +/- 1-3 cm.