Description: Keep your network running smoothly by testing your cables to uncover problematic shorts, open wires, crossing pairs and other wiring mishaps Use for testing your homemade Ethernet patch cables to make sure they are in working order prior to connecting to your devices Tests RJ45 cables, RJ11 telephone cables and network cables Easy to read LED display indicates problems Hand-held for portability Detachable master/ remote unit for versatility Connect cable to both master unit and remote to test cable for problems Requires one 9V battery (not included) Specification: Material:Plastic Size:10x9.5x2.cm Color:Black Function: 1. pairs of twisted pair 1, 2, 3, 4, 5, 6, 7, 8, G line by root (on) test, and can distinguish between which root (right) wrong line, short circuit and open 2. Switch ON is the normal test speed, "S" is the slow test speed, M is the manual gear. 3. Twisted-pair test: turn on the power, the network cable plugs were inserted into the main tester and remote tester, the host lights from 1 to G one by one flash Package Includes: 1PiecexNetwork Tester