Fiber optic adapters that deliver stable and reliable performance across a range of equipment and networks. They are suitable for use in fiber optic distribution frames, networks, and instruments, in addition to red light pens, fiber optic sensors, optical power meters, fiber optic link transmission equipment, jumpers, and fiber optic communication equipment rooms. Connector type and fiber compatibility: LC/UPC connectors with Single Mode Duplex fiber. Size: 34 mm x 22 mm x 9 mm (L x W x H). Package includes 4 pcs x fiber optical coupler. Performance and durability: Insertion loss is low, with the average additional loss value less than 0.2 dB. callbackloss, with plug and unplug times greater than 1000 times. Good isolation that suppresses ground loop noise and isolates other interference signals. interchangeability, repeatability, wear resistance, reliability, and stability. How to use: According to the fiber and interface types, insert the optical cable end to be connected to the connector interface. Secure fiber optic connectors as needed. Applications and scenarios: Use in fiber optic distribution frames and networks to enable stable, reliable connections between duplex singlemode fibers. Suitable for configurations involving red light pens, fiber optic sensors, optical power meters, and fiber optic link transmission equipment, as well as jumpers and fiber optic equipment rooms. Helpful in lab or maintenance environments for connecting and reconnecting fiber links with durability and repeatability.