The latest premium product of our standard phones is the D-400, whose tidy, touch-screen-dominated design of any modern office environment is well-visible. Its high-resolution color display with capacitive touch is designed for intuitive operation and designs the visualization depending on the situation. An all-round visible housing LED ensures that even when telephoning via a concealed headset, everyone sees that the telephone is being used. Incoming calls and missed calls are also displayed clearly.The D-400 also proves its professional variety with the expansion options: Whether you use the D-400 with its 20 digitally labeled and freely programmable function keys or extend it to 80 keys with the D-XT20 key extension module â everything can be connected at the two USB ports. The ideal companion for office and home office.This text is machine translated.