The Snom D3 is the optimal expansion module for the Snom D3xx series desk phones with USB connection.

The expansion module allows users who make a lot of calls greater flexibility and productivity by
providing 18 programmable LED function keys with features such as line hold, speed dial, extension
and presence indication.

The Snom D3 with its high-resolution black-and-white display can be easily connected via plug-and-play
using a USB cable. Up to three extension modules can be connected in series to expand the range of
functions enormously. This provides up to 54 additional function keys.