This 4-port hybrid extension card made by Panasonic can be a valuable addition to your office telecom system. It is compatible with the KX-NCP500 and KX-NCP1000 phone switching systems and is ideal for businesses in need of additional phone lines. The card is specifically designed for the DHLC4 model and can be seamlessly integrated into your existing system. With this extension card, you can easily expand your phone system's capabilities without worrying about the condition of the product. Its compatibility with specific Panasonic models ensures smooth installation and reliable performance. Enhance your office communication system with this reliable and efficient 4-port hybrid extension card.