THE SHORT ANSWER
A label that lists only 100 V does not document 120 V operation. A label that explicitly lists a range containing the local supply answers one voltage question; it does not verify frequency, plug, manufacturer support or warranty.
Nominal supply and rated input describe different things
A country’s nominal supply is a reference for its electricity system. The product’s rated input is a requirement published for the equipment. Use both, while confirming the actual intended outlet.
Japan’s representative supply is 100 V. The United States and Canada are commonly represented as 120 V. Neither a shared plug shape nor anecdotal use broadens a manufacturer’s input rating.
Read what the label actually says
Preserve ranges, separators and any selector instructions. A continuous 100–240 V range differs from two manually selected ranges. A nearby DC output number is not the mains input.
If a seller quotes a range, compare it with the exact model manual and the label on the supplied power component. Similar names or a different regional variant are not sufficient evidence.
Why trial operation is not verification
A device turning on does not establish that its intended operating conditions or manufacturer restrictions are satisfied. Do not use an initial successful connection as a replacement for official specifications.
When ratings are unavailable, leave the voltage check unresolved. A useful record says what still needs confirmation rather than turning the absence of a warning into approval.
What to record for a model-specific answer
Collect the exact device model and charger model if applicable, the AC input ranges, frequency, plug and grounding conditions, and any official statement about overseas operation. Keep source links for every field.
The checker evaluates these as separate dimensions. Review any mismatch or limitation before choosing an accessory or replacement product.
- Use the actual input field, not output voltage.
- Do not silently round 100 V up to 120 V.
- Preserve selector ranges and conditions.
- Use official evidence for the exact model and component.
Rating-label examples
| Example label | What it tells you | What still needs checking |
|---|---|---|
| AC 100 V | A stated 100 V input | Any permitted range, frequency and manufacturer conditions |
| AC 100–120 V | A stated range containing 100 V and 120 V | The full manual, frequency, grounding and service |
| INPUT 100–240 V ~ 50/60 Hz | A stated wide AC input and two frequencies | The exact component, connector and manufacturer conditions |
Illustrative labels, not specifications for a particular product. No compatibility verdict is inferred from these examples.
MOVE FROM GENERAL GUIDANCE TO YOUR MODEL
Check the exact model.
Use the full model number on the unit or charger. Missing evidence is reported as insufficient information.
Search a product name or the full model number. Confirm the exact suffix on the product label, box or manual.
Models with current official facts
These records have enough current evidence for a model page. This list is not a compatibility endorsement.
Questions before use
Is 100–120 V the same label as 100 V?
No. One states a range; the other does not document that wider range. Verify the complete specification and its conditions.
Does a transformer change every compatibility issue?
No. Frequency, manufacturer policy, service and regional restrictions remain separate checks.
Can I reuse a result for a similar model?
No. Check the full model number, suffix, sales market and supplied power component.
CHECK THE ORIGINAL INFORMATION
Sources & Evidence
Guide examples are separate from the model evidence database. A source on this page does not automatically verify another model or manufacturer.