Network Crimper: Works for RJ11 (6P4C)/RJ12 (6P6C)/RJ45 (8P8C) connectors. Cable Tester: 1.Test RJ11/RJ12/RJ45 cables. 2.Test correspondingly double-twisted cables 1 2 3 4 5 6 7 8 and Ground. 3.Can judge wrong connection short circuit and open circuit. 4.Put cables into both main tester and remote tester. 5.The lights of the main tester will turn on sequentially from 1 to G. 6.Detachable remote tester test remote cable up to 1000ft. in length. 7.Power supply: 2 pcs AAA batteries (not included). UbiGear One-Year Limited Warranty with 100% Satisfaction Guarantee! If there is anything wrong with your order just let us know and we’ll take care of it.