This RJ12 RJ45 Network Cable Tester can judge wrong connection, short circuit ADM open circuit

Put cables into both main Cable Tester and remote tester. The lights of the main tester will turn on sequent from 1 to G

Network Phone Cable Tester powered by DC 9V battery ( not included )

Supports System Win XP/Linux/Android 2.x/Android 4.x/Win 2008/Win vista/Win7 32/Win7 64