The pedal is closed up at the moment, so I'll have to verify it again later, but I'm pretty sure the symbol for a transformer was underneath the part itself. I've been wrong before, thought! It has 4 terminals and looks like a tiny transformer. I took it out and tossed a 7805 in there and it seems to be working well. I'm just not sure if it's supposed to be operating at a higher voltage. Being a digital pedal, would it operate at more than 5 volts?