Item specificsOperate with one 9V battery ( Not Included ) Test correspondingly double-twisted cables 1， 2， 3， 4， 5， 6， 7， 8 and G.Capable to judge wrong connection， short circuit and open circuitCable Tester for RJ11， RJ12， RJ45， Cat 5e， Cat 5， 10/100 Base-T， AT&T 258 A， TIA-568A/568B .etcPut cables into both main tester and remote tester， the lights of the main tester will turn on sequent from 1 to G.Main Tester: 1-2-3-4-5-6-7-8-GRemote Tester: 1-2-3-4-5-6-7-8  RJ451-2-3-4-5-6...    RJ121-2-3-4.........    RJ11. Package included:1 x Cable Tester