New Touchpad Trackpad With Three Button Keys for Thinkpad T440 T440P T440S T450S T450 T540P T431S T550 L440 L540 L450 T450S W540 W541 W550S T550 series Condition:New and Original Part Fit Models:Thinkpad T440 T440P T440S T450S T450 T540P T431S T550 L440 L540 L450 T450S W540 W541 W550S T550 series Warranty:3 months Premium Gift: 1 pieces of Low Profile trackpoint newly designed from T430 on.