Power Supply Product Parameters: Maximum Input: 100-240V 50-60Hz; Laptop Charger Maximum Output: 20V 6.75A 135W (also compatible with 20V 4.5A 90W). Please note!!!! Not compatible with 170W, 230W!!!! Connector Size: USB square yellow end Widely compatible models: 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. P1 2nd Gen, P1-20MD ,P1-20ME, ThinkPad P1 3rd Gen, ThinkPad P15v-20TQ , ThinkPad P15v-20TR , ThinkPad T15p-20TM , ThinkPad T15p-20TN , X1 Extreme 1st Gen , X1 Extreme 2nd Gen , X1 Extreme 3rd Gen Widely compatible models: Fit for 135w charger 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 E440,E450,E455,E460,E465,E470, E475, E540, E550, E550c, E555,E560