The SMT50 is advertised as needing 220V to operate. This was a bit of a concern because I'd have to run a special outlet. I was assured by the company that I could "convert" the machine to 110V. Turns out that just meant flipping a switch on the power supply.

In the above photo showing the underside of the machine, the power supply is the silver box, middle left. On the side of it (and difficult to see) is a recessed switch to switch between 220V and 110V. Move the switch right (as seen in his picture) for 110V operation. It would have been helpful if the company had been more clear on this point.