Feature: 1. ELIMINATE DEAD ZONE: Launch cable box is mainly used to make up for the blind spot of OTDR test, there is no welding head in the middle of the fiber, possess small size, light weight, easy to carry, very convenient 2. PRESS DESIGN: Press the spring can be used to release the jumper, and press again after the disc is used to hide the jumper to avoid clutter 3. APPLICABLE SCENARIO: OTDR fiber optic transmission cables are used to measure loss and reflectivity of near end connections, as well as remote lossless insertion of fiber optic lines using OTDR 4. FOR SINGLE MODE: SM singlemode launch cable box adopts SCUPC to SCUPC single mode connector, suitable for single mode cable 1310/1550nm 5. PACKAGE INCLUDE: Optic fiber OTDR elminator come with 2 accessories, 1 lanyard, easy for you to install and use Specification: Item Type: OTDR Launch Cable Box Connector: SCUPC to SCUPC single mode. Package List: 1 x Extension Box2 x Accessories1 x Lanyard Note: Most of the line length of the product is bare fiber, can not be removed, only about one meter at both ends of the interface pigtail.