LS Express supports item barcodes.
How to set barcode on an item
Select the action menu from the item card and open the Barcodes.
Add a new barcode.
Note that an item can have many barcodes, but a barcode can only be linked to one item.
How to scan an item barcode
With a scanner simply scan the barcode, and if the barcode is linked to an item the item will be added to the sale.
Note that the focus must be on the input field when scanning.