Mini Pro LAN Network Detachable Cable Tester.Ports: 2 x RJ45 and 2 x RJ11.Put cables into both main tester and remote tester. The lights of the main tester will turn on sequent from 1 to G.Test correspondingly twin-twisted cables 1, 2, 3, 4, 5, 6, 7, 8 and Ground, also with volume wheel to control the speed FAST or SLOW.Detachable Remote Tester, test remote cable up to 1000ft. in length.Network Cable Tester can judge wrong connection, short circuit adm open circuit.Lan Cable Tester powered by DC 9V battery (not included) Size: 11.1 x 9.6 x 2.4cm.