Japan uses 100 volt for most audio equipment at 60hz.
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You don't say where you are but you don't have 50-60Hz.
You have either 50 or 60 Hz.
The voltage is not that big of an issue (200 vs 220 vs 240) but some devices will not work correctly if the Hertz aren't correct. That is less of an issue as we become more universal and devices are designed for a global market but it can be an issue so you need to know. I suspect you are 50Hz if in Europe and that is the same as Hong Kong.
Isn't the frequency in europe 50Hz anyway - if so, you can just change the cord or get an adapter for your country. As far as 50 vs 60 Hertz, a turntable that uses a AC Motor wont work. But many other electronics work ok with either 50 or 60 Hz. A Power Transformer that is rated at 60Hz will draw more current at 50hz because of less inductive reactance.