Barcode, 2D code & QR code scanners Handheld Handheld barcode readers, 2D and QR codes are designed for all situation where data is to be transmitted to a computer by cable or wireless (for example, Bluetooth). In pocket memory scanners, data are first collected and stored in memory, and then transferred to the computer. Wired Wireless scanners Pocket scanners with memory Alphabetically (article code) Most popular Less expensive first Most expensive first