No need for line of sight. RFID readers do not require the direct line of sight to read the data from a tag. Therefore tags can be read through packaging materials, which makes possible to hide them inside. Reading the data from a tag is possible by letting it pass an interrogator reading area, possibly on a high speed. Since the principle of work of barcode scanners is the visual registration, they always require a direct line of sight for reading and proper mutual orientation of visual tag and reader is important for successful operation.