Snom D7C Expansion Module with Colour display - USB - Supports D7x Series with USB

Benefits:

Large high-resolution colour screen
Daisy chain up to 3 modules 
Power supplied by the telephone via USB
16 freely programmable function keys
3 virtual pages for up to 48 keys per module
USB output for USB accessory usage
Multicolour LED function keys
Modern design
Theme and icon support
Custom background image support
Activity page for better overview*

16 Configurable MultiColour LED keys, High-Res Colour Display, Daisy-chain up to 3 modules