Main Features: 1.Test correspondingly double-twisted cables 1, 2, 3, 4, 5, 6, 7, 8 and ground2.Capable to judge wrong connection, short circuit and open circuit3.Cable tester for Rj11, Rj12, Rj45, cat 5E, cat 54.It can easily clarify cable, continuity, open and short5.Verifying cable continuity, open, short and cro wire pair up to 1000Ft with remote kit Benefits: 1. Visible LED status display.2. Check the RJ11& RJ45 Cable quickly.3. Automatically runs all tests and checks for continutiy, open,shorted and croed wire pairs.4. Slow and fast test switch.5. Optional for the power systerm Attention: 1.Don't connected high voltage lines to avoid buring out the machine. 2.Put into the right place to avoid hurting others,because of the sharp part. 3.Connected the cable to the right port. 4.Read the user manual before use it.