Can I plug my Apple charger into 220v 50 Haz power supply?

Traveling to South Africa and Namibia soon. I have the electrical plug adapters that will slow plugging in common US electrical devices..... but the supplied voltage will be 220vac at 50 hz. Many US devices are dual voltage automatic or selectable do I won’t need a voltage transformer for powering those My question is: Is the Apple wall charger a dual voltage device ( will it operate satisfactory plugged into a 220vac power source to allow charging my iPhone 6 ?