Features: Use to test your Ethernet patch cables to ensure they are in good working order before connecting them to your devices. Support network RJ-45 cable continuity tester. This tester also tests BNC network cables. It can be used to test UTP cable (RJ-45 connector) and USB signal wire. It can distinguish which wire is well connected, out of sequence, short circuit and open circuit. Keep your network running smoothly. This tester can test USB interface, USB common interface and USB printing interface. LED display: easy to read data and find problems. Features: Material: plastic Power supply: DC 9V laminated cell (not included) Test cable: USB [printing cable], RJ45 [network cable], switch port Package size: 16 * 11.5 * 3.5cm Package weight: 140g Package List: 1xNetwork Cable RJ45 USB Tester