Compatibility ThinkPad 11e Series, 11e 1st Gen (AMD Windows), 11e 1st Gen (Chromebook), 11e 1st Gen (Intel Windows), 11e 2nd Generation (Intel Windows), E Series- E440, E450, E455, E540, E550, E550c, E555, L Series- L450 Input:100-240V 50-60Hz.Output: 20V 8.5A 170W Outlet: 3-prong Connecter size: USB Rectangular shape(pin) Compatibility ThinkPad Helix (1st Gen), S Series- S431, S440, S531, S540, T Series- T431s, T440, T440p, T440s, T450, T450s, T540p, T550, W Series- W540, W541, W550s, X Series- 11e, X1 Carbon (3rd Gen), X240, X240s, X250, Yoga- Yoga 12 (S1), Yoga 14 (S3), Yoga 15 (S5). Safety - All of our product lines are put through rigorous quality control procedures to ensure safe, reliable operation for years to come. In addition, our products are in compliance with top industry standards, and include numerous safety mechanisms, including protection against short circuiting, overvoltage, overcurrent, and internal overheating Package:1 x Power Cord.