The short answer
Chargers, AC adapters and products have an "INPUT" label.
- If it says 100-240V, it covers the voltages of the countries in the list below (100β240V). No transformer is needed; if the socket shape is different, use a plug adapter
- If it says only 100V, it is meant for Japan. Do not use it as is in countries with a different voltage. Get a product that supports that country's voltage, or use a transformer (check the transformer's manual for which products and wattage it supports)
- For switchable products (e.g. 100-120V/200-240V), set the switch to the local voltage before use
- Plug adapter: only matches the socket shape. It does not change the voltage
- Transformer: changes the voltage. Used to run a 100V product in a country with a different voltage
PR Example plug adapter (Japanese online stores)
supports plugs A, B, BF, B3, C, SE, O, O2 and CB (the store's names), rated 6A 250V. It cannot convert voltage and cannot be used in Japan, the page says.
supports types A, O, BF, C and SE (the store's names), 100-240V. It does not convert voltage and cannot be used in Japan, the page says.
PR Example voltage transformer (Japanese online store)
rated capacity 30W, input 110-130V / 220-240V (automatic switching) β output 100V. The page says it cannot be used with high-wattage appliances such as hair dryers.
| Country / region | Voltage | Plug types |
|---|---|---|
| Japan | 100V | A, B |
| South Korea | 220V | C, F |
| Taiwan | 110V | A, B |
| United States | 120V | A, B |
| Thailand | 220V | A, B, C, F |
| Hong Kong | 220V | D, G |
| China | 220V | A, I |
| Vietnam | 220V | A, B, C |
| Singapore | 230V | C, G, M |
| United Kingdom | 230V | G |
| France | 230V | C, E |
| Australia | 230V | I |
Source: IEC (International Electrotechnical Commission) World Plugs country list (as of June 2025). The IEC no longer publishes this list, so a copy is kept on this site (retrieved 2026-09-27)
It may differ by region or building within the same country. For other countries, see the list by country and region.
- Plug-in type (no battery): allowed in carry-on and checked baggage
- Battery type (cordless): allowed with conditions if the heating part and the battery can be separated. If they cannot be separated, not allowed in carry-on or checked baggage
- Gas type: allowed with conditions, up to 1. Spare gas cartridges are not allowed. On international flights, it is not permitted in the cabin unless it fits into a 1 liter (about 1 quart) clear bag
Source
Source: MLIT: "Attention! Customers purchasing hair care items: Check that your purchase can be taken on board your aircraft!" (English version) (retrieved 2026-09-27)
Handy to have before you go
PR Example power bank (Japanese online stores)
Power banks go in your carry-on, not your checked bag
rated battery capacity 3.7V/10000mAh 37.0Wh, labeled as meeting PSE technical standards.
capacity 10000mAh; the label on the unit reads 5000mAh 7.2Vdc / 36Wh; PSE (notifying company: γ’γ³γ«γΌγ»γΈγ£γγ³ζ ͺεΌδΌη€Ύ).