Was in the market for a new Oral B toothbrush and wanted that was 100-240v as I've just come back from Japan and was annoyed my Toothbrush is the only appliance I have that won't do 100v!
Can confirm the plug adaptor that comes with this for the travel charger case is 140-240v it's 2 pin only as Japan mostly only has 2 pin outlets no earth
Apart from that it's very handy you can charge with the case so I don't need to carry the charging base with me. Maybe one day these Toothbrushes will just accept PD!
I price matched at Chemist Warehouse and so got it for $146 so even more of a bargain!
Looks like it's pickup only however as it's on clearance but again you can price match it anyway to get from CW or somewhere else :)
Did you stay at a hotel in Japan? The shaver port / outlet is usually 110/240v depending on how you plug it in