Electricity

The voltage in Japan is 100 Volt.
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).

Plugs

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 have two, non-polarized pins, as shown above. They fit into North American outlets.

Japanese power outlets are identical to ungrounded (2-pin) North American outlets. While most Japanese outlets these days are polarized (one slot is slightly wider than the other), it is possible to encounter non-polarized outlets in some places.

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 purchase electronic appliances in Japan for use outside of Japan, you are advised to look for equipment specifically made for oversea tourists.

Wi-fi

In Japan, you will find many Wi-Fi signals which you can enjoy browsing the internet. Please note they often require a password for security reasons. (In an effort to prevent internet-related crimes, service providers are required to identify whom they are providing the services to. Some require long-term contracts which normally are limited to residents of Japan.)Also, most accommodations are internet-ready.
In such case, please use a wireless travel router.
If your budget allows, hiring a mobile hotspot device at the airport is another good option. You can use it in any areas the mobile covers.

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