You don’t need to have any reason for exercising this right — you can simply change your mind

Consumers located in the EU are also protected by a default legal 2 year guarantee on products purchased at no additional cost. Here again: 2-years is the statutory minimum

EU consumer law applies to contracts or other legal relationships between consumers (on one side) and professionals, businesses, companies on the other (B2C). It does not apply to B2B (e.g. a supermarket places an order with its fruit supplier) or C2C relationships (e.g. I sell my old bike over eBay).

In the US, there is no one national law in regards to returns/refunds for purchases made online as in most cases, this is implemented on a state-by-state basis, however, under several state-laws, if no refund or return notice was made visible to consumers before purchase, consumers are automatically granted extended return/refund rights. In cases where the item purchased is defective, an implied warranty may apply in lieu of a written warranty