04W3949 | SD20A06039 | Lenovo ThinkPad Pro 40A0 Dock

• 3x USB 2.0, one supports always-on USB charging
• 1x USB 3.0
• 10/1000 Gigabit Ethernet, supports enterprise manageability
• 1x VGA
• Driver-free, perfect video quality
• Security lock hole
• Convenient eject button for one-step system removal
• Physical rear alignment for a perfect dock every time

As per Internet following are the compatible models but please do your research before ordering.
L440 L450 L460 L540 L560 L570 P50S P51S T440 T440p

Dock only,

No Key, No AC Adapter