The D3 Expansion Module provides an additional 18 multicolored LED keys that can be programmed for functions such as line, speed dial, busy lamp field and presence indication.
A multicolored LED key presents call or presence status, and the high-resolution display provides a visual interface that can be easily configured and labelled via the phone’s web interface or directly on the phone itself.
The D3 connects to the telephone using a USB cable and up to three D3 expansion modules can be daisy-chained to provide 54 function keys.