W550s X240 X250 X260 X1 Carbon Helix. We have the best aftersales service. There are no exceptions! Your reliance and supporting are our great honors. Replace Part Number ： ( Tip size：Lenovo U ). Output DC connector:4pcs, detachable（4.0x1.7mm,5.5x2.5mm,7.9x5.5mm,Lenovo U）.
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