Network Cable Tester For RJ45 Features : Test correspondingly double-twisted cables 1, 2, 3, 4, 5, 6, 7, 8 and Ground Able to scan/judge for the miss wiring, wrong connection, disorder cable, open or short circuit Cable Tester for RJ11, RJ12, RJ45, Cat 5e, Cat 5, 10/100 Base-T, AT&T 258 A, TIA-568A/568B Verifying Cable continuity, open, short and cross wire pair up to 1000ft with remote kit. 9 LED lights to indicate wiring connection on both the remote and the master unit connection on both remote and master unit Auto scanning function for rapid testing. Grounding Test Build in power switch for power saving Operate with one 9V battery