This Excelsus Filter-Splitter is designed to improve internet broadband and telephone router connection. With a DSL/Phone (RJ-11) Female connector and RJ-11 connector hub, it effectively filters out interference to provide a clear phone signal and faster internet speed. The flat cable design is ideal for easy installation and storage. Perfect for any home or office that requires a high-quality broadband connection without interruptions. This product is compatible with various routers and telephone systems.