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SPECIFICATIONS: Tests continuity & polarity of data. Continually scans all twisted pairs. Tests network cable pin continuity and polarity. 2 x RJ45 and 2 x RJ11 ports. RJ 45 RJ11 Cable Tester tests RJ11 and RJ45 network cables Ports: 2 x RJ45 and 2 x RJ11 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. Network Cable Tester can judge wrong connection, short circuit / open circuit Put cables into both main tester and remote tester. The lights of the main tester will turn on sequent from 1 to G. Detachable Remote Tester, test remote cable up to 1000ft. in length. Lan Cable Tester powered by DC 9V battery (not included) Size: 11.1 x 9.6 x 2.4cm Weight: 148g .