This Panasonic KX-TDA5161 4-port door phone card is the perfect addition to your KX-TDA50 phone switching system. With its sleek design and reliable performance, this card ensures that your office or business communications are always clear and efficient. Featuring a brand name you can trust, this door phone card is designed to provide you with a seamless interface for managing your incoming calls and connections. Whether you're a small business owner or a professional in a larger corporation, this card is an essential tool for maintaining clear and consistent communication with your customers and colleagues.