The Panasonic KX-TDA0164 4-Port External Input/Output Card is a brand new, never opened device designed for use with Panasonic conventional system phone switching systems. Made in Japan, this card offers four input/output ports for connecting various devices in a business or industrial setting. With its reliable brand reputation and specific model designation, this external card provides a dependable and efficient solution for expanding the capabilities of a Panasonic PBX system.