Specification: Features: Automatically runs all tests and checks for uncover problematic shorts, open wires, crossing pairs and other wiring mishaps. Networks cable tester, Visible LED status display. 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 networks cables. Compact size,lightweight,hand-held for portability. Requires one 9-Volt battery not included.Battery is advised to change if any weak light appears. Notice: Actual color may be slightly different from the image due to different monitor and light effect Specification: Main tester: 1-2-3-4-5-6-7-8-G Remote tester: 1-2-3-4-5-6-7-8-G ----RJ45 1-2-3-4------------------RJ11 Size:As the picture shows Power supply: 9V batteryNot included Package List: 1x Networks Cable Tester