Understand the difference between a converter and an adapter. The current on the French side is 220, so any 110 appliances will need a converter. Most electronics now will operate on either 110 or 220. You can verify this my reading the small print on the power supply. To use these, you'll only need an adapter so that your US plug will fit into the French outlet. If your appliance will only operate on 110 current, you'll need both a converter and an adapter.