Telephone Line Cable Adapter - RJ11 Telephone Splitter (2pack Black) Smooth connection: Telephone adaptor has high-quality sound quality,accurate signal transmission,easy to use,convenient connection,and low signal attenuation coefficient. Widely used: Telephone adaptor can be used for all telephones and fax machines, and is a helper for office meetings, home entertainment and learning. High quality: The telephone line cable adapter is used to connect and extend the two existing telephone lines with the phone through box, with RJ11 6P4C plug for connection extension. Durable material: Telephone line cable adapter high-quality PVC internal insulation, strong anti-interference ability, oxygen-free copper conductor, high-fidelity design, exquisite craftsmanship.