Lenovo ThinkPad Docking Stations

Lenovo Docking Stations for ThinkPad laptops comes in 3 models - Basic, Pro and Ultra. Below are the differences

Lenovo ThinkPad Docks	Model
Features	Basic	Pro	Ultra
Power button	×	×	×
Key lock indicator		×	×
Docking status indicator		×	×
Eject button	×	×	×
Sliding adjuster	×	×	×
Docking station connector	×	×	×
System lock		×	×
Security lock slot		×	×
Always On USB 2.0 connector	×	×	×
USB 2.0 connector	2	2	2
USB 3.0 connector	×	3	3
Ethernet connector	×	×	×
AC power connector	×	×	×
DisplayPort connector		×	2
HDMI connector			×
DVI connector		×	×
VGA connector	×	×	×
Audio connector		×	×