Tono voltage

[Mamimili]

i am having another senior moment, i have an urge to play my Tono stuff but i cannot remember the correct mains voltage.

Tono Personal, there is nothing written on the back...

Tono Violin says 110 / 230v, but i cannot remember if i need to open it to use a voltage selector or if i can just plug into 230v mains?

I really need to write these things down