Feature:Cable Tester for RJ11, RJ45, 10/100 Base-T and telephone cable, etcSwitch on the power on the main tester.Test of the RJ45 RJ11 Cat-5 Cat-6 cable:if all the cables work ,the lights will become green from NO.1&2 to NO.7&8 sequently.if any light is not on or turns on unsequently,the cables are broken.Automatically scan mode, rapidly testing, the streamline shape is in accordance with the design of somatologyDurable design, working well even in construction locationSuper handy device ensures your good moodCable Tester for RJ11, RJ45, 10/100 Base-T and telephone cable ... etcAutomatic efficient scan for the miss wiring, disorder cable, open and short circuitRemotely test cable up to 1000 ft in length ( remote kit included )8 LEDs to indicate which wire whether open or not on both remote and master unitPowered by DC 9V reduplicated battery (not included)Protective power switch for low power consumption Package1 x Cable tester (not battery)