Will this handle two external monitor and display at full resolution? Are there limitation when connection multiple monitors?

you can hook 3 externals with two that have the same resolution but 4k will not be possible. Thunderbolt tech would be needed and you would need to go from a mechanical dock to a usb dock by lenovo

Does this work with the x1 carbon 9th gen?

No the item is NOT compatible with the X1 Carbon 9th generation model. X1 Carbon 9th generation - see Lenovo part # 40y0090us or Lenovo part # 40B00300US.

Is this compatible with the T580?

This docking station is ABSOLUTELY compatible with the T580. In fact I am writing this answer on a T580 docked to this docking station (40AJ0135US). I didn't even need to update drivers or anything.

Compatible with T470?

The t470 is NOT compatible with this item . 40AJ0135US mechanical Lenovo ultra dock is compatible with ; A285 , A485 , L13 Clam , L13 Yoga , L14 AMD G1,L15 AMD G1, L480 , L490 , L580 , L590 , P14s AMD G1 , P15s G1 , P43s , P52s,P53s, P43s,T14 AMD G1, T14s AMD G1, T580, T590, T480s, T480, T490, T490s , T495 , T495s, X1 Carbon Gen 6 , X1 Carbon 7th Gen., X1 Yoga 4th Gen, X1 Yoga 5th Gen , X390 Yoga, X395 , L14, L15, P14s , T14 ,T14s , T15 , L13 Clam 2019 , L13 Yoga 2019, X13 AMD G1 ,X13 G1 ,X13 Yoga , X280 , X390 Yoga ,X390 ,X395. DO NOT ASSUME THAT THIS IEM WORKS IN ALL X , T , YOGA . X1 SERIES AS IT DOES NOT ! LENOVO MODEL #'S AND SERIES #'S ARE SUFFIX AND GENERATION SPECIFIC.

ASIN	B079NM5JK4
Best Sellers Rank	#42,813 in Computers ( See Top 100 in Computers ) #272 in Laptop Docking Stations
Item model number	40AJ0135US
Manufacturer	Lenovo
Product Dimensions	37.85 x 16 x 5.33 cm; 811.93 g

Lenovo ThinkPad Ultra Docking Station (40AJ0135US)

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