Excellent performance: The coupler has the advantages of high precision, good consistency, high reliability and good stability. Long service life: The adapter can be reused up to 1000 times, which is more than similar products. Uses: The connector can be used for optical fiber fusion splicing and connector coupling with low insertion loss and high return loss characteristics. High-quality materials: The connectors are made of high-quality metals and plastics, which are and have a long service life. Specification: Item Type: FC Male to SC Female Fiber Optic Adapter Insertion Loss (dB): 1310nm ( less than or equal to 0.3), 1550nm ( less than or equal to 0.3) Return Loss (dB): 1310nm ( greater or equal to 60), 1550nm ( greater or equal to 60) Interchangeability (dB): less than or equal to 0.20 Operating Temperature: -25 Celsius ~ +75 Celsius Storage Temperature: 25 Celsius ~ +75 Celsius colour: blue + silver Material: metal size: length about 46mm Package Contents: 4 x FC Male to SC Female Fiber Optic Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.