Kashimura TI-34 70W AC220~240v to AC100v Voltage Converter [TI-34]
Converts countries with AC220~240v electricity to Japan's AC100v standard so that you can safely plug in your Japanese domestic use devices.
When using for over half hour, a converter can only reliably supply up to 80% of its rated capacity. Tthis model reliably supplies up to 56W (80% of 70W). So, your devices total rated requirement should be < 56W.
If your device needs to generate heat, eg. hair dryers, your device's rated requirement should be 3 times lower than the converter's rated capacity. For this model, your devices total requirement should be < 23W (1/3 of of 70W).