The Panasonic KX-TDA5172 8 Port Digital Extension Card is a versatile and reliable telecom system designed for business use. With its 8 ports, it allows for easy expansion and addition of new features to your existing phone switching system. The Panasonic brand ensures quality and performance, making this digital extension card a valuable investment for enhancing your office communication setup.For KX-TDA5,KX-TDA50G.