When traveling to Japan from Australia you should know they use different electrical plugs. They have two straight vertical pins. Therefore, it pays to get yourself a universal adapter or at least a Japanese to Aussie adapter.
…and don’t do what I did and buy a universal adapter that has everything but a Japanese plug?!
In Japan, the power plugs and sockets have a standard voltage of 100 V and the standard frequency is 50 / 60 Hz. In Australia it is 230 V, so you may need a voltage converter.
Check your appliance plugs and device chargers to see if they are rated for dual voltages. For example, the charger on my phone, reads “Input: 100-240V…”. If your appliances do not support both, than you will need a voltage converter.
You might like to also have a power bank handy to charge devices quickly and on the go.

Appliance/Device | Dual Votage |
Iphone | Yes |
Ipad | Yes |
Laptop | Yes |
DSLR | Yes |
360 Camera | Yes |
Headphones | Yes |
Speaker | Yes |
Hairdryer | No |
Hair straightner | No |
Toothbrush | No |
Going through my own list, it appears while most computer gadget devices have dual, the personal care appliances tend not to.