4U Wallbox, Swing Frame, 600mm Deep, Black

The D3 Expansion Module provides an elegant way to increase the available function keys on D3xx telephones, allowing users to manage a large number of extensions and calls.

18 highly configurable self-labeling multicolor 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