Lenovo ThinkPad Ultra Dock Station 40A1 for L440 L540 X240 T540 T440 WITH KEYAll units are used, tested working condition. "The ThinkPad Pro Dock 65W is supported on ThinkPad L440 and L540, ThinkPad X240, ThinkPad T540p, ThinkPad T440 Integrated graphics models only (Discrete graphics models not compatible), ThinkPad T440p, and ThinkPad T440s Integrated graphics models only (Discrete graphics models not compatible)."Requires a 65W or better Lenovo laptop charger to function. Key is not required to function, but is included. A different shipping service than the one shown may be used if free shipping is selected, and the delivery date could change as a result. Please select a faster shipping option or contact me if you need something specific. Please contact me if you have any questions.