Black Phone extension cord with standard phone connectors on both ends. Connect two phone devices together or connect a phone to a wall jack. Made from high quality material to last in rough weather conditions.This Telephone Cable cord will work for DSL Internet. Our telephone cable include 2 Core Telephone Cable and 4 Core Telephone Cable and 6 Core Telephone Cable as well as 8 Core Telephone Cable, Round Telephone Cable and Flat Telephone Cable. Excetp those telephone cable, our factory also supply Network Cable and Lan Cable. Any further question, please feel free to contact us anytime.