Multi-function cable tester:This muli-function cable tester is sturdy and ,it has compact structure, strong function, and easy to use, it is a good helper for wea electrical engineering for installation, debugging, and maintenance. This device con auickivtest cabies with any combinatons of thato owna connertors: nowerCON SPFAKON XIR Din.-BNC.3 5lar 6.35 Jack, RJ45,RJ11, -A and USB-B 17 types of cables, and through-pipe wall) cable. is designed to check sound connectors and cables for cable on-off, dislocation, or open-circuit. it comes with audio signal generator and audio power amplifier, t can easily test the connection and working condition of the whole audio system and find out the fault point quickly. OPERATINGINSTRUCTIONS:1. Short cable test:When Cable Tester A & B are used tocether, they can chec connectors and cables listed for the on-off, dislocatlon, shell collislon and other conditions.Turn the power/status switch from "OFF"to "ON-CABLE TESTE,cable tester A, and to "ON1--10" of cable tester B, Currently, the power/status LED shows red. Color: As Shown Material: Metal Package Contents: 1 x Cable tester (without 2x9V alkaline batteries,You need to prepare yourself) 1 x Data cable Only the above package content, other products are not included. Note: Light reflection 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.