The Panasonic KX-T7740 is an add-on-module for any Panasonic PABX
telephone. It adds an additional 32 DSS/BLF (busy lamp field)buttons that can be used to see busy extensions and transfer calls easily. The KX-T7740 also adds 16 One Touch Feature Access Buttons. 32 Key DSS console with dual colour LED (red/green lamp status), including up to 16 programmable DSS keys. Available in black or white.