The only good advice would come from a lawyer. That said, you probably can't afford it, maybe several kilobucks a year. Anybody can sue anybody here for just about anything. If you don't have enough assets to make suing you worthwhile, the odds are less that it will happen, but it still could. What are the product risks? IMHO, selling anything dangerous if you're exposed to liability is nuts. Can it electrocute somebody? Can it start a fire? Can you drop it on your foot? Can a child swallow any parts of it. Does it have batteries? Does it have a cord somebody could trip over or hang themselves with? Could it distract somebody while doing something else? IMHO again, the best bet for power is an approved wall wart, not direct line connection. If you're going to sell it elsewhere, can you get a CE mark? Even if you self-certify, going through the standards (that you have to buy!) will tell you a lot. BTW, if it has a clock or digital circuits, it might need an emissions test to be sure it passes FCC.