KX-TD50170 Panasonic 8-Port Digital Hybrid Card for KX-TD500. Supports 8 extensions (digital, analog, or single line). Most versatile card of the Panasonic series because it is compatible with many different models and offers easy compatibility when changing extensions.
KX-TD50170 is the most popular card of the KX-TD500 series. Each card takes one slot in the system. Any mix of cards such as KX-TD50172, or KX-TD50174 can be used in conjunction with the KX-TD500 system.