Panasonic KX-TDA0180 8-Port Analog Trunk Card LCOT88-Port Loop Start CO Trunk Card (LCOT8)2 power failure transfer portsRequires 1 free slotAdd 1 optional 8-port Caller ID cards (TDA0193) for Caller ID supportUse with KX-TDA100, KX-TDA200, KX-TDE100, KX-TDE200 and KX-TDE600 systems..