Most serial numbers can be found on the actual product itself, usually on the back side. Serial numbers can also be found in an accompanying manual or online at the brand's website.
Different products have different serial numbers and these serial numbers are important for both producers and consumers. These numbers create separation and uniqueness, making the product easily identifiable when necessary. Stored in online databases, receipts and packaging, serial numbers are usually required to be able to resell or get a refund for a product. Because they are often the only characteristic that separates similar products, police investigators use the differences in serial numbers to track down criminals.