Sales Inventory - Serial Numbers
If you choose to use serial numbers on a item, like a dvd or Blue Ray player, the program will let you record the serial number in history when the item is sold.
This allows you to know what customer bought what, when, and the serial number (so they can't bring back something they bought somewhere else).
This works well for theft too, so you have a serial number to report to the police.
Sales Inventory -Serial Numbers