That the tool accepts the line voltage of nearly every country, so a plug adapter is enough. Read the whole range though: 120–240 V leaves Japan out, and 110 V alone leaves everywhere else out.
Three kinds of marking appear on the tools here, and they mean three different things.
100–240 V — everywhere. This is the widest marking and it covers Japan at 100 V, North America at 120 and Europe at 230. Both replacement chargers on this site state it as an input: the BENSN at 100–240 V, 50–60 Hz, and the MEROM.
120–240 V, or 110–240 V — everywhere except Japan. The Remington CI41MS5 states 120–240; four straighteners here state 110–240. The gap at the bottom is twenty volts and one country, which is the kind of detail that only matters once.
110 V, or 110–120 V, or “single voltage” — North America only. Six products here say so, and the clearest is the TQCIR at $140, whose listing does not merely omit the other range but prohibits it: 220–240 V is named and ruled out. The AVENHO at $56 puts “110–120 V only” in the product name itself. The Remington Shine Therapy at $34 states US and Canada.
Where the figure is
In small type on the body of the tool, or molded into the power supply block. On a cordless tool it is on the charger rather than the tool, because the charger is the part that meets the wall.
Two products on this site publish no voltage at all — the REVLON straightener at $14 and the Wild Willies at $30 — and on those, the tool is the only source.
What it does not tell you
The plug shape. A dual-voltage tool still needs a plug adapter abroad; the voltage range only tells you that an adapter is enough.
The frequency. Most supplies state 50–60 Hz, which covers both grids. Where only one is stated, that is worth the same look as the voltage.
Whether a converter will carry it. A converter has a wattage rating, and a hair dryer at 1500 to 2400 W is beyond most of the travel converters sold for phones.
Check your own manual before you follow anything here. Temperatures, water ratings and supply voltages differ from model to model, and the maker’s own figures take precedence over anything written on this site. A supply of the wrong voltage is a failure rather than a slow charge, and the figure is printed on the tool — not inferred from a connector that happens to fit.
Prices quoted in this text were read on October 10, 2026. The live price is at the top of the page.
Last reviewed October 10, 2026