Do you need a Travel Adapter for Japan? (What Power Outlets are like in Japan)

What this video shows

From the guide “Japan Power Plugs: Plug Type, Voltage and Your Devices”: Japan uses Type A power sockets: two parallel, flat pins. The standard supply is 100V AC, and the frequency is 50Hz in eastern Japan and 60Hz in western Japan.

The guide goes on: “What Japanese plugs and sockets look like”. JNTO describes Japanese sockets as using Type A plugs, with two flat pins side by side.

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