20V 2.25A USB Tip 45w Laptop Charger Or Power Supply Cord for Lenovo Thinkpad : X240 X240S X300S X301S S230U S431 T430 T431S T440 T440P T440S T450 T450s T460 T460S T540P T550 T560 L440 L450 L540 T540P E431 E440 E450 E455 E460 E465 E531 E540 E550