• Detect faulty RJ45, RJ11 and BNC cables with this network cable tester. Connect one end of the cable to the main unit, the other to the detachable remote unit, and turn on the power. Already laid cables can also be easily checked.
• You can use the test LEDs to see how the cables are wired: to identify short circuits, incorrect wiring, or crossover connections.
• The network tester has 2 speeds: 1) press "ON" to perform a cable test at a moderate speed, 2) for slow speed: press "S". The position "OFF" switches off the device.
• Power supply from the line tester is via: 9V PP3 block battery (not included in delivery); Color: gray / green; material: plastic
• Scope of supply: 1x network cable tester (main unit & remote unit with RJ45 socket and RJ11 socket), 1x case, 1 manual

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Features:

• Test of double-twisted cables: Switch on the power. (S is the slow automatic grade, MIS manual.)
•  Put cables into both main tester and remote tester.
• The lights of the main tester will turn on sequently from 1 to G.
• Main tester:1-2-3-4-5-6-7-8-G.
• Remote tester:1-2-3-4-5-6-7-8-G RJ45.
• 1-2-3-4-5-6 RJ11.

Following are abnormal connections:

• If one cable, for example, cable NO.3 is open-circuited, the two NO.3 lights of the main tester and remote tester will not turn on.
• If several cables are not connected, several lights will not turn on respectively. If less than two cables are connected, none of the lights is on. If two ends of a cable are disordered, for example, NO.2and NO.4 then displays on:
•  Main tester:1-2-3-4-5-6-7-8-G.
• Remote tester:1-4-3-2-5-6-7-8-G.
•  If two cables are short-circuited, neither of the corresponding lights is one of the remote testers while the main tester remains unchanged. If three cables, including three, are short-circuited, none of the corresponding lights is on.
• If test patch panels or wall plate outlets, two cables that can match each other (RJ45) will be connected to the tester.
• If test cables of the same axes, BNC turns on when the cable works.
• 9V reduplicated battery is used in this tester. The battery is advised to change if any weak light appears. ( Battery is not included.)

Feel free to have a look here;