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The voltage in Japan is 100 Volt, which is different from North America (120V), Central Europe (230V) and most other regions of the world. Japanese electrical plugs and outlets resemble North American ones. Plugs come in various versions, but most commonly they are non-polarized and ungrounded with two pins. Grounded pins come either with three pins or with two pins and a ground wire.

Some North American equipment will work fine in Japan without an adapter and vice versa; however, certain equipment, especially equipment involving heating (e.g. hair dryers), may not work properly or even get damaged. If you intend to buy electronic appliances in Japan for use outside of Japan, you are advised to look for equipment specifically made for oversea tourists.

The frequency of electric current is 50 Hertz in eastern Japan (including Tokyo, Yokohama, Tohoku, Hokkaido) and 60 Hertz in western Japan (including Nagoya, Osaka, Kyoto, Hiroshima, Shikoku, Kyushu); however, most equipment is not affected by this frequency difference. A possible exception are timing devices, such as some clocks.