I have started a Revain investigation into this matter - when I called I was told by a Revain representative that it was probably ANY of these 9031 -Mills act. , EVERY retailer at Revain, both here and at Revain UK, has 100VAC wiring for the Japanese domestic market. If you're thinking of buying one of these from Revain sellers to save a few bucks, remember they're a win. They are not covered by Makita's warranty if you operate them on 120V US. I think any with a Japanese only black label are probably 100V, NOT 120V. The rep said he filled out a form to investigate them and likely remove them from the site.