1BARCODE REREAD PREVENTION TECHNOLOGY: This 2D barcode scanner use intelligent product detection technology. After scanning the barcode, the product should be completely taken out of the window, and the code will be read a second time after re entering, completely solving the problem of reread misscan 2FAST AND EFFICIENT: 2D hands free barcode scanner use high frame rate CMOS sensor and custom lens combined with excellent image algorithm to quickly recognize all types of bar codes 3SELF SENSING SCANNING FREE HANDS: Just put the bar code near the desktop scanning gun, can automatically wake up and read, without key scanning, saving energy and time 4COMPATIBLE WITH ALL SYSTEMS: 2D QR barcode hands free scanner is plug and play, support for LINUX, for ANDROID, for Windows XP, for WIN 7, for WIN8, for WIN10, for OS X and other operating systems 5WIDE APPLICATION: Omnidirectional USB wired desktop barcode reader is ideal for supermarkets, malls, bookstores, drug stores, libraries, gift shops, boutiques, sporting goods stores, jewelry stores, multimedia stores, florists and other retail outlets