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 Degrees and 28 Degrees – Fully configurable via host phone – 18 highly configurable self-labelling 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 for first D7 module