They come with 110v, 1210's always (im pretty sure) have a voltage switch but it's not on all 1200s. I opted to get a good step down transformer that was purely for japanese devices (100v) instead of risking it with a cheaper 120v american transformer, even though people said it might work I wouldnt risk it on a $600+ piece of art like a technics. Another word of advice is to be very wary of the ones that are tiny and look like they're only plug adapters - if it's from china, definitely avoid. http://www.ebay.com.au/itm/100-Watt-Jap ... fa2&_uhb=1 That's the one I bought (for some reason it's cheaper than the 50w version lol). Plenty of overhead (you could have like 6 1200's plugged in at once if you wanted) and spare fuses.