Lenovo Thinkpad X1 Carbon charger.

Stop lugging your AC adapter back and forth. Get an AC adapter for your notebook and keep one in the office and one for home or travel.
The Lenovo 90-Watt AC adapter enables you to operate your notebook or charge the battery from electrical power outlets.
Brand new – Genuine quality laptop charger.
Designed for reliable performance and high durability.
In conclusion This charger is 100% compatible with your laptop.