This duplex extension enables connection of two telephones or accessories. It easily extends the reach from outlet to your devices. Designed for superior signal transmission and maximum compatibility. Cable Type: Duplex Outlet Line Extension Cord; Connector/Port/Interface: 6P4C Plug; Dual Jack; For Device Type: Telephone; Telephone Accessory; Connects Devices (From/To): Telephone; Telephone Accessory to Modular Phone Wall Outlet.