①. Standard duplex LC connector, bend-insensitive single-mode 9/125 fiber ②. Duplex clips are easy to insert when holding the connectors together ③. 100% functional test to performance and integrity ④. Single-mode 9/125 fiber for testing applications ⑤. Type: Loopback module ⑥. Test wavelength: 1310 and 1550 nm ⑦. Fiber: Single mode 9/125 ⑧. Connector: LC/ ⑨. Insertion loss: typical: less than or equal to 0.20dB maximum: less than or equal to 0.30dB ⑩. Repeatability: less than or equal to 0.10dB ⑪. Interchangeability: less than or equal to 0.20dB ⑫. Durability: less than or equal to 0.20dB typical change, 1000 plugs ⑬. Working temperature: -20 to +70 degrees ⑭. Storage temperature: -40 to +85 degrees ⑮. Application: fiber laboratory, telecommunication test, FTTX test, patch panel application, equipment interconnection ⑯. colour: black + blue ⑰. Material: plastic ⑱. Package Contents: 2 x Loopback Adapter ⑲. Only the above package content, other products are not included. ⑳. 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.