EnGenius DuraFon PRO Expansion Base Brother Power users with dual monitors:

Power users with dual monitors: The UD-3900H is the dock you need to maximize your productivity and your workspace

Feel your reflexes become one with the action

the Poly Edge E300 Series pairs Poly noise reduction technology with cutting-edge design

FRĒ with MagSafe is tough and sustainable

Manufacturer Part Number: 77-88442

EnGenius DuraFon PRO Expansion Base Brother Power users with dual monitors:EnGenius DuraFon PRO Expansion Base The EnGenius DuraFon PRO BU is the expansion base that enables connection of an additional four (4) lines ports to an existing DuraFon PRO installation. Also use the DuraFon PRO BU for "Extended Range" options that are available with the DuraFon PRO product line. Multi Line Functionality Supports up to 90 DuraFon PRO or DuraWalkie Handsets Works Behind any Analog Port (PBX, VoIP, PSTN, FXS or POTS) Expandable for