Nogis Tip Diameter 7.9*5.5mm Converter Power Adapter Connector Converter For Lenovo Ideapad Yoga 11, 11s, 13, 2 Pro, Flex 14, 15 ; Lenovo ThinkPad Helix, x240, Carbon X1,P/n 0b46994, 0c19868, 0b47046, 0b47048 Ultrabook From Round To Square Connector Power Adapter Supply Cable Cord Compatible with :Lenovo Ideapad Yoga 11, 11s, 13, 2 Pro, Flex 14, 15 ; Lenovo ThinkPad Helix, x240, Carbon X1 ; Compatible P/n 0b46994, 0c19868, 0b47046, 0b47048 Ultrabook PLUS, it has a USB connection can charge your iPhone when use laptop. This device converts the round connector on the old adapter to a rectangular connector that fits your New Lenovo Laptop square connector. Tip Diameter :7.9*5.5mm .make sure the size fit your needs before purchasing. Customer called it excellent quality for the money.