UCC 128 labels, or now known as the GS1 128 label, allow your customer to scan the label’s barcode and find out what the contents of the carton are before opening it. It is the most often used in the retail and manufacturing industries. The GS1-128 barcode (data carrier) was developed to provide a global standard for exchanging data between different companies. 

This label is placed on the packaging container, usually on a pallet or a carton. When the carton is received, the recipient scans the label (usually on a conveyor belt with an automatic scanner) and the inventory levels are automatically updated. The MAN-002 element in the 856 is the unique barcode ID. 

It is a GS1 Standard that defines the data format. In essence, GS1-128 (also formerly known as UCC/EAN-128) is a derivative language of the Code 128 symbology, utilizing a flagging character (Function Code 1 (FNC1)) and application identifiers.