The honest answer: it depends entirely on which country you're selling into. Some markets (US, most of Western Europe) don't require pre-market registration. Others (Canada, Australia, UAE, Saudi Arabia, South Korea) require full product registration or notification before a single unit can legally be sold. Here's the breakdown.
Selling without required registration exposes you to: product seizure at customs, import refusal, retailer de-listing, fines and penalties, and in serious cases criminal liability. Amazon and major retailers in registration-required markets will not list your product without proof of registration.
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