Lenovo ThinkPad USA Ultra Dock With 90W 2 Prong AC Adapter (40A20090US, Retail Packaged)

COMPATIBLE with the following 65w and 90w ThinkPad models: ThinkPad L540, L560, P50s, T440p, T460p, T540p, T550, T560, X240, X250, X260, and the ThinkPad W550s. Also compatible with the following DualCore ThinkPad Models with Integrated Graphics: L440, L450, L460, T440, T440s, T450, T450s, T460, T460p, T460s. NOT recommended if the system AC adapter is 170W.

from Consumer Electronics Store http://cestore.net/accessories-supplies/computer-accessories/laptop-netbook-computer-accessories/docking-stations/Lenovo-ThinkPad-Adapter-40A20090US-Packaged.html?pid=B00E0E2DIE