Panasonic KX-TDA0144 Brand New Includes One Year Warranty, The Panasonic KX-TDA0144 8 channel cell station interface card is required for multi-cell operation. The KX-TDA0144 supports up to 8 cell stations (KX-TDA0142). One card requires one universal card to configure a system. KX-TDA0144 Features: Hybrid IP 8 Port Cell Station Interface Card (CSIF8), Required for Multi-Cell Operation, Supports up to 8 KX-TDA0142 Cell Station, 1 Card Requires 1 Free Slot, Will Not Work Without Phone System: Panasonic KX-TDA50, KX-TDA100, KX-TDA200 or KX-TDA600