C 4.0 1.7mm LENOVO, HP, TOSHIBA. W550s X240 X250 X260 X1 Carbon Helix. Quality: High Efficiency, High Reliability, Low Ripple & Noise. ThinkPad E431 E440 E450 E455 E460 E531 E540 E550 E555 E560 E570 L440 L450 L540 P50s T431s T440 T440p T440s T450 T450s T460 T460s T540p T550 T560 T570.
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