Uvital RJ11 Duplex Wall Jack Adapter Dual Phone Line Splitter Wall Jack Plug 1 to 2 Modular Converter Adapter for Office Home Fax Model Cordless Phone System, White, Wireless (2 Pack)

Additional Details from the Manufacturer

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More features

• [Dual-Port Expansion] Converts a single modular phone jack into two outputs, allowing connection of two devices simultaneously
• [Please Note] Designed for splitting standard RJ11 phone lines — not for signal conversion or internet/network transmission
• [Stable Connection] 4-conductor duplex in-wall adapter ensures clear, reliable voice and data performance
• [Universal Compatibility] Works with phones, fax machines, answering machines, caller ID,etc
• [Plug and Play] Easily plugs into any standard modular wall jack