Panasonic KX-NCP1190 ***REFURBISHED*** Optional 3-Slot Base Card OPB3 (USED)Good ConditionOptional 3-Slot Base Card (OPB3)Compatible with KX-NCP500 and KX-NCP1000 Panasonic Phone SystemsEquipped with 3 connectors to receive 1 or more of the following Optional Daughter cards: 4 Channel Message C..