1. Different scanning devices: Different scanning devices have different recognition capabilities for QR codes. Some scanning devices can only recognize the two-dimensional code of a specific size or resolution, so the two-dimensional code of a large box is easier to recognize.
2. The contents of the QR code are different: although the QR code numbers of the big box and the small box are the same, they contain different information. The QR code of the big box contains more drug information, production date, expiration date and so on, while the QR code of the small box only contains basic drug information and production date and so on.
. 3. Two-dimensional code positions are different: the two-dimensional code of the big box and the small box are located in different positions, and some scanning devices only recognize the two-dimensional code of a specific position. Therefore, even if the two-dimensional code numbers of the big box and the small box are the same, but the positions are different, the big box can scan the information.