Panasonic KX-DT543-W Digital Phone24 Programmable Line Buttons 3 Line Backlit LCD Display Hands Free Speakerphone Electronic Hook Switch Works with hte following Panasonic phone systems: Panasonic KX TDA 50 50G 100 200 600 Panasonic KX TDE 100 200 600 Panasonic KX NCP 500 1000 Panasonic KX NS100 The Panasonic KX DT543 W is a corded digital telephone which is designed to work with Panasonic KX DT590 48 key DSS console business telephone system. With it's 3 line graphical LCD back lit