Testing of twisted pair cables: Turn on the power. (S is in slow automatic class, wrong manual.) Insert cables into both main tester and remote control. The main tester's lights light up in sequence from form 1 to G. Main tester: 1-2-3-4-5-6-7-8-GRemote tester: 1-2-3-4-5-6-7-8-G RJ451-2-3-4-5-6 RJ11 The following are abnormal connections: If one cable, for example cable NO.3 is open, the two NO .3 lights on the main signal and the remote control not to light up. If several cables are not connected, several lights will not light up. If less than two cables are connected, none of the lights are on. If two ends of a cable are disturbed, for example NO. 2 and NO. 4, then appears on:Main Tester: 1-2-3-4-5-6-7-8-GRemote tester: 1-4-3-2-5-6-7-8-GIf two wires are shorted, none of the corresponding lights on the remote tester will light up while the main tester remains unchanged. If three cables, including three, are shorted, none of the corresponding leagues are turned on. If test plate panels or wall plate outlets, two cables that can match each other (RJ45) will be connected to the tester. If test cables with the same axes, the BNC will light up when the cable works. 9V reduplicated battery used in this tester. The battery is recommended to be replaced if low light resists. (Battery not included.)Type: RJ45 Cable Connection Tester Color as show Size as show Material: plastic Package include: 1pc RJ45 cable connection tester Note: 1. Please note that due to lighting effects, monitor's brightness/contrast settings etc, there could be some slight differences in the color tone of the website's photo and the actual item. 2. Item measurement by hand, it may be 1cm different, your kind understanding will be highly appreciated.