Cable Tester Multi Functional with LED Indicator for RJ45 RJ12 and RJ11 With Battery Product Features: Test correspondingly double-twisted cables 1, 2, 3, 4, 5, 6, 7, 8 and Ground. Capable to judge wrong connection, short circuit and open circuit. Cable Tester for RJ12, RJ11, RJ45, Cat 5e, Cat 5, Cat 6, 10/100 Base-T, AT&T 258 A, TIA-568A/568B etc. It can easily clarify cable, continuity, open and short. 9 LED lights to indicated wiring connection on both remote and master unit Grounding Test. Build in power switch for power saving. Power: 9V Battery (Included) Package Includes: 1 x LAN Tester 1 x Tester's Battery Put cables into both main tester and remote tester. The lights of the main tester will turn on sequent from 1 to G. Detachable remote tester, test remote cable up to 1000ft. in length. Power supply: