Feature: 1. MAIN FUNCTION: Mainly used to compensate for OTDR test blind spots, to measure the loss and reflectivity of near end connection, use OTDR to insert fiber lines remotely and lossless. 2. CONVENIENT USE: The jumper cable box has pop cover design, which can be pressed and popped up to remove the jumper. After use, the jumper cable can be coiled back to avoid clutter. 3. SINGLE MODE: The OTDR test extension cable has SCUPC‑LCAPC single mode connector, suitable for single mode cable 1310/1550nm, with safe operation, stable performance. 4. ENOUGH LENGTH: The fiber test extension cable has sufficient length to ensure that the use limit is small and the range is wide, so that it can be used anytime and anywhere. 5. COMPACT SIZE: The OTDR jumper box has a compact size, convenient to use, equipped with a hanging rope, easy to carry, suitable for indoor and outdoor electrical application. Specification: Item Type: OTDR Launch Cable Model: AUA-20 Connector: SCUPC-LCAPC Single Mode. Package List: 1 x Extension Cable Box2 x Accessories1 x Hanging Rope 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.