Panasonic KX-NS5174 16 Port SLT CardPanasonic KX-NS5174 16 Port SLT Card adds 16 Analog Internal Lines and it has a caller ID on All Ports w/ FSKIn addition it has a message waiting indication4 RJ45 socketsIt does includes MCSLC16 Card & Mounting HardwareMoreover it works with the following systems: Panasonic KX-NS500, KX-NS700, KX-NS520 and KX-NS720
