Check this website for the model:
PM-5012 Model AC / DC Smart Charger | Power Master | Your Best Battery Chargers Manufacturer
It says "for 110 or 230 Volt AC +/-10%".
There maybe a concealed switch on the outside or or one the inside. Even if there is no switch, are you game
to connect it to 110 Volt? I don't think harm will be done, it may just.......not work
, but if I was a betting man.... I think it could.
Another consideration, if you are in the USA, what is the value of such charger not working on 110 or 120 Volt? Next to nothing I suspect. With trying, what would you loose?
However the presence of the wording "+/- 10%" might indicate that the full range of 110-230 Volt is not
covered. Or is it 110 Volt -10% and 230 Volt +10%?
the company (click on "contact us"), and ask the question.