The KX-TDA system is available with a full range of digital proprietary telephones and a DSS console. If 24 keys are not enough, a simple 12-key add-on DSS module(KX-T7603) provides the answer. It's suitable for the KX-T7636 and the KX-T7633. If you are looking for an even larger DSS console, the 60-key KX-T7640 is also available. All proprietary telephones in the range (including DSS console, 12-key add-on module and USB port options) are available in charcoal/black or white.