The tester is a small hand-held cable tester, which enables network profeionals to quickly and easily verify the integrity of Ethernet twisted pair cables. Features 1. Tests UTP(Unshielded Twisted Pair) and STP(Shielded Twisted Pair) cable. 2. Checks continuity and configuration of wiring with RJ45 plugs. 3. Tests for open circuits, shorts, ,miswires, reversals, and split pairs. 4. SHIELD detection tests a cable's shield integrity. 5. Debug mode quickly identifies which cable pairs have a specific wiring fault. 6. Main unit and Remote unit allow one person to test T568A, T568B, 10Base-T, and Token Ring. 7. Powered by 4 LR44 button cells. Specifications Cable Length: Minimum: 1m, Maximum: 300M Battery: 1.5V button cell, LR44 or equivalent, 4 pieces Size: 1062825mm (in storage state) Weight: about 52g (including battery)