SGTIN extends the general EAN.UCC specification for a GTIN, which identifies only a class of object, and uniquely identifies a single item. SGTIN supports up to the full 14-digit GTIN and adds a serial number for uniqueness of object. Therefore, where UCC/EAN bar codes have traditionally been used , the SGTIN specification combined with an RFID tag can give visibility beyond the item reference right down to the exact serial number of the item.