Power Gear Phone Line DSL Filter, One Device, Male to Female, 1 Line Noise Filter, for Answering Machines, Telephones or Fax Machine, White, 76246 Eliminates telephone interference within the DSL band while optimizing DSL signal For use with phones, answering machines, fax machines, modems, and other telephone devices One filter needed for each telephone device Simple, plug-in operation LIMITED LIFETIME WARRANTY