What Does "100–240V" Mean? (Dual Voltage Explained)
"100–240V" means your device is dual voltage: it works on any grid in the world with just a plug adapter — no voltage converter needed.
Most modern chargers — phones, laptops, cameras, tablets, most CPAP machines — are dual voltage. The label reads something like "INPUT 100–240V~ 50/60Hz".
You'll find the rating on the device, its plug, or its power brick. The voltage range is the part that matters for safety.
If the label shows only a single value such as "120V" or "220–240V", the device is single voltage and is not safe to plug into a different voltage without a converter.
Check your exact device and destination →
Related guides
- Adapter vs Converter: What's the Difference?
- What Happens If You Plug 110V Into 220V?
- Step-Up vs Step-Down Converters
Guidance only — not professional electrical advice. Always confirm against your device's label before plugging in. Local wiring (especially in hotels and older buildings) can vary.