The D7 black expansion module features 18 multi-color LED keys which can be programmed with all functions available known from snom phones. The high-resolution display provides a perfect visual interface which can be easily configured and labelled via the phone€™s web interface or directly on the phone itself. Using the D7 could not be easier: simply connect the USB cable and it€™s ready to use. Three D7 expansion modules can be daisy-chained to add up to 54 function keys to your phone. The D7 is the perfect addition to any snom 7-series desk phone. Features - 18 highly configurable self-labeling LED keys - High-resolution black & white display with backlight - Daisy chain up to 3 modules - Plug and play - Power supplied by phone via USB port