Lenovo 135W Slim Tip AC Adapter ( 4x20e50558, Retail Packaged Lenovo Originals ) 4x20e50558 Thinkpad 135w Ac Adapter with 2 Prong Power Cord Slim Tip Connector To Laptop. Lenovo Retail Product In The Factory Sealed Original Retail Packaging. Does not support models with a Quad Core Processor / It is not compatible with ThinkPad laptops with the round, barrel-type power plug. Compatible With Lenovo Models E440,E450,E455,E460,E465,E470, E475, E540, E550, E550c, E555,E560,E560p, E565, E570, E570p, E575, S431, S440, S531, S540,L440, L450, L460, L470, L540, L560, L570, P40 Yoga, P50s, P51s, T431s, T440, T440p, T440s, T450, T450s, T460, T460p, T460s, T470, T470p, T470s, T540p, T550, T560, T570,T Helix (1st Gen) ,S1 Yoga 12, S3 Yoga 14, S5 Yoga 15, Yoga 14, Yoga 260, Yoga 370, Yoga 460, W540, W541, W550s, X1 Carbon (3rd Gen), X1 Carbon (4th Gen), X1 Yoga (1st Gen), X240, X240s, X250,X260, X270. AC type: Universal Input, Worldwide Agency Support, AC input voltage: 100 V to 240 V; 50/60 Hz, Input connection: Includes standard AC power cord.