I'm traveling to Europe and am confused about using appliances?

I'm going to both Spain and France next month for two weeks, and hair dryers and appliances are necessary, as well as my iPhone. I understand that the plugs are not the same, and adapters are needed for that purpose. I have bought multiple adapters. HOWEVER, I'm aware that the voltage and currents are not the same as they are in America.

I have heard that most Apple products are "intelligent" enough to recognize different voltage, and switch automatically to avoid killing the device. Is this true?

Also, I have bought a Step Down Converter to decrease the voltage from the European amount to the American amount. This is where I'm confused. On my converter there's a label listed with:
Input: 220/240 V
Output: 110/120 V
Power: 200 Watts Max

I lucked out and my hotels all have hair dryers provided, but my hair straightener and curler are both labeled 120/240 V… I don't understand. Is this the Input for the converter? Will it be safe to use with the converter in Europe, or not? I might just go online to Conair and purchase another converter if necessary specifially for their products.

Devices that are labeled 120/240 V don't need a voltage converter. They may have a switch that has to be set properly.

In us the voltage is 120v and 220 in France. But be also careful of the frequency which is 50hz in France instead of 60hz in us. So you need a transformer and a adapter to adapt the plug.