Color:5M Black Product Description Conductor: copper Wire diameter: 0.4 copper(single) Size: 5 meters (plus or minus two percent) Line core: 4 root Insulation: HDPE Wire shield: PVC Product Features: Single insulated wire according to the different pitch twisted pair, and with specified color combinations to identify line, reduce the mutual interference between the clues crosstalk, power consumption is small. It is a ideal phone accessories, and can connect your phone with a RJ11 connection to another RJ11 devices. Easy to install for the home, hotel, office and other telephone systems. The phone wire can be used with 2 or 4 wire systems. The cord has a variety of possible uses, such as connecting two telephones devices together, connecting a telephone device to a wall jack, or as an extension cord. This phone extension cord allows you to have your phone 16.5ft away of your phone jack and not having to move every time you need to use your phone. Standard phone connectors on both ends, plug and play ready for fax lines, modems, cordless or standard phones. Scope of application: Telecommunication engineering wiring, links between indoor telephone communication cable system wiring, voice communication system between the main line, program-controlled switches, phone, fax and digital television.