Lenovo Ultradock 40A20170US for P50s, P51S, T440, T440p, T440s, T450, T450s, T460, T460p, T460s, T540p, T550, T560, T570, W540, W541, W550s, X240, X250, X260, X270 Lenovo Retail Packaged and Lenovo Factory Sealed 40A20170US Is USA Product. 170w ac adapter has a 2 prong power cord. Compatible with L440 , L450, L460, L470, L540 , L560, L570, P50s , P51s , T440, T440p, T440s , T450, T450s, T460, T460p, T460s, T470 ,T470p ,T470s, T540p ,T550, T560 ,T570, TP25 , W540, W541, W550s ,X240 ,X250 ,X260, X270. This item is NOT Compatible with the P50, P51, P70 or P71. ThinkPad Ultra dock is capable to support up to 4k2k(3840x2160)@60Hz via either 1 of 2 DP ports, or support dual 4k2k@30Hz via 2 DP ports. Actual video output on the dock is based on system video performance since the video signal is passing through from system to the Ultra dock. Some of the video ports do have exclusive use and are also dependent on the docked ThinkPad configuration. WARNING - THIS ITEM IS " NOT " COMPATIBLE WITH THE FOLLOWING MODELS - L480 , L580 , P50, P51, P52s , P70, P71,T480 , T480s , T580 , X280 , All X1 Carbons, All Yoga Models , All Helix Models. Supports models with integrated graphics only. Does not support models with discrete graphics.This item is NOT Compatible with the P50, P51, P70 or P71.