The ThinkPad Mini Dock Series 3 - 90W Features and benefits:

Six USB 2.0 ports

Any two, of the three, video ports can be used simultaneously:

VGA analog monitor supporting 1920 x 1200 resolution

RJ-45 Ethernet port

ThinkPad Mini Dock Plus Series 3 - 90W includes a 90WAC Adapter.

ThinkPad L412*, L512*, L420, L520 All ThinkPad T400s, T410, T410i, T410s, T410si, T420, T420i, T420s, T420si, T510, T510i All ThinkPad T520, T520i Dual Core Models only ThinkPad X220 All * For more informations please read: http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-72871