- D7 Expansion Module in Black- Supports all 700 series telephones with USB ports- High-resolution graphical display with backlight - 18 freely programmable multicolor LED function keys - Dual-angle foot stand: 46 and 28- Fully configurable via host phone - 18 highly configurable self-labelling LED keys - High-resolution black and white display with backlight- Daisy chain up to 3 modules - Plug and play- Power supplied by phone via USB port for first D7 module