If the product you bought is in perfect condition, the seller is not obliged to exchange it in case you changed your mind. However, many sellers offer this possibility within 8 days from the sale. In such case, you will need to present the respective invoice.
Some sellers also give additional guarantees: e.g. “if you are not fully satisfied with your product, you are entitled to return it and claim a refund”. When making a claim, always refer to the general conditions of the sales contract, or inquire in-store. If the trader has mentioned anything concerning exchanges or refunds in his advertisements (either in-store or on the invoice or any on other material), they are obliged to respect this.
