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Panasonic KX-TD170 Station Expansion Card
Panasonic KX-TD170 Digital 8 Extension Expansion Module. Required when expanding an 816 or 1232 digital phone system in order to add more stations. The KX-TD1232 Control Unit will support up to 2 KX-TD170 Modules and the KX-TD816 Control Unit will support 1 KX-TD170 Module.