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Compatibility – Works with RJ11 6P4C cables, supporting landline phones, fax machines, and ADSL broadband modems. Secure & Stable Connection – Ensures reliable signal transmission with minimal interference for clear voice and data transfer. Compact & Lightweight – Space-saving design for easy storage and portability in home or office setups. Tool-Free Installation – Simply plug and play—no wiring or technical skills needed for quick setup. 4-Piece RJ11 Coupler Set – Includes four 6P4C female-to-female adapters, ideal for extending phone, fax, or ADSL modem connections.