Since those don't use either 120v (60Hz) or 220v (50Hz), etc., either should work just fine PROVIDED you use the correct wall power supply. The unit says it needs 12-watts, 9-18v DC, with the center pin positive (+). You can find a generic one that will work just fine!
Something like THIS. (You'll just need to search for one you like.)
I've got the studio version of this being looped just to be a bit different than usual. ?
(I've done many covers of this using many exotic instruments including one with a rubber chicken and a turkey baster! ?)