07-27-2017 07:48 AM
Welcome to the Community Forums.
The AC Charger for the Yoga 720 (as listed page 88 of the hardware manual) have auto volt technology with AC input voltage : 100 ~ 240V 50 ~ 60 Hz that can handle 220v used in other countries.
What concerns you more would be power surges, so as it can handle the difference in voltage it would be safer if you connect it with a surge protector or automatic voltage regulators for additional safety net.
Hope this help answer your query.