Hand-held portability. 
Power Source: DC 9V Battery Required (not included). 
Easy to read LED display displays problems. 
Tester RJ45 RJ11 RJ12 CAT5 CAT6 UTP USB LAN Wire Cable Cable Tester. 
Automatically runs all tests and inspections by testing cables to detect faulty short circuits, disconnected wires, cross pairs, and other wire faults to keep the network running smoothly.