SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/trav-dual-voltage-label-adapter-only

Your phone charger's label says Input 100-240V. What do you need to use it in Europe?

Only a plug adapter. The charger already handles the higher voltage.

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  1. A voltage converter and an adapter
  2. Only a plug adapter ✔
  3. Nothing at all, it plugs right in

Why: A label of 100 to 240 volts means the device is dual voltage and works on world current. You still need a plug adapter, because the adapter only changes the plug's shape to fit the outlet.

Huh, didn't know that: Most modern electronics have a voltage converter built in, and more hair dryers and flat irons now come with a voltage switch.

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References

Answer: Only a plug adapter. A label of 100 to 240 volts means the device is dual voltage and works on world current. You still need a plug adapter, because the adapter only changes the plug's shape to fit the outlet.

  1. Grand Valley State University Study Abroad: Electrical Adapters www.gvsu.edu/studyabroad/electrical-adapters-58
    If it lists input from 100-240 v, it will work in any place you may travel.
    Checked 2026-10-10.
  2. Purdue University Study Abroad Handbook: Technology Abroad www.purdue.edu/gpp/sa/outbound/studyabroadhandbook/technologyabroad.html
    A small plug adapter allows American-style plugs (two flat prongs) to fit into other countries' outlets.
    Checked 2026-10-10.

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