Features: networkings cable pairing instrument is suitable for checking on/ offs state of line, shielded networkings cable testing, and long distances testing. Removable split structure, easy to separate and combine the 2 part for meeting various needs, easy to operate. Frees choice of two speeds: the defaults boot is a constant speed test, and the fast Sgears can be adjusted manually. Crystalhead on-offs test: it can test 2core, 4core, 6chip telephone line; testing differentcores, the corresponding lightison. Applicable to RJ11, RJ45, telephone line, routers, opticals modems, etc., widely used in networkings communication maintenance, wiring networkings engineering monitorings line maintenance. Specifications: Material:ABS Battery is not included. Package Includes: 1x Cable Tester note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.