Now， the network USB LAN cable tester supply is increasing. As long as one of them generating problems， the computer hardware may work wrongly and burn the related accessories. We recommend this RJ45 RJ11 Network USB LAN Cable Tester. It builds in power switch for power saving， 9 LED lights to indicated wiring connection on both remote and master unit. It is capable to judge wrong connection， short circuit and open circuit. In addition， it has the characteristics of durability， reasonable prices and excellent quality. I am sure that the cable will be good choice for you.                                    Features            Test correspondingly double-twisted cables 1， 2， 3， 4， 5， 6， 7， 8 and groundCapable to judge wrong connection， short circuit and open circuitIt can easily clarify cable， continuity， open and shortVerifying cable continuity， open， short and cross wire pair up to 1000ft with remote kit9 LED lights to indicated wiring connection on both remote and master unitAuto scanning function for rapid testingBuild in power switch for power savingOperate with one 9V battery (not included )                                                            Specifications            Weight    4.09 oz / 158 g    <br>Dimensions    (4.13 x 4.1 x 1.06) " / (10.5 x 10.2 x 2.7) cm (L x W x H)    <br>Color    White Green    <br>Material    PC    <br>                                                            Package Includes            1 x Network USB LAN Cable Tester