Maniacal Doodler

Doesn't this build use a battery pack though? I get what you mean about the dangers of mains voltage but this particular one doesn't seem to use it at all.

I want to try this for fun, and possibly to trick my friends a little... Thought I'd turn to some people who knew what they were doing first as the video looks a little sketchy and I don't want to electrocute myself. Thanks!