From Lenovo, their 45W AC Power Adapter with Extension. Model: ADLX45ULCU2A

Features:
-The Lenovo USB-C 45W AC Adapter is the ideal charging solution when your USB-C device calls for more power.
- Designed for not just your everyday office worker, but also professionals constantly on the go; the adapter boasts a sleek and compact design well suited for either your desk or your bag.
- Regardless of where you decide to plug in, your device will receive 45W of energy efficient power - all you need is an outlet and some time. Stable, adequate and reliable power supply.