This is an Arduino compatible QR-code and Bar code (1D/2D) scanner or reader module. Power = 5V Interface: UART aka "Serial" or "TTL" and works with Arduino Software Serial, baud rate = 9600 MH-ET LIVE Scanner v3.0 is a barcode and QR code scanning recognition module. It adopts a professional image processing chip for barcode recognition. It can quickly and accurately read under the high performance of fast and stable reading in complex environments. Take one-dimensional code and two-dimensional code on the carrier of paper, screen, plastic, etc. . Small in size, onboard USB and UART interface, can be directly connected to the computer, or integrated into a variety of devices. The product features low power consumption and low heat. Quick start, cold start and warm start can be kept on standby, no need to wait, it is ready to open. Features: Easy to operate, no need to understand complex image recognition algorithms. Support for reading of common one-dimensional codes and two-dimensional codes such as Barcode and QR code. Onboard micro USB and UART serial port for access to a computer or embedded device. Onboard auxiliary light source for reading in a completely dark environment. Support for setting module parameters by scanning the setup code (see the specification for details). Settable parameters include (read mode, baud rate setting, command mode. Type of barcode/QR code reading: Read barcode type (1D): UPC/EAN, UPC/EAN with supplementals, BooklandEAN, ISSN, UCC Coupon Extended Code, Code 128, GS1-128, ISBT 128, Code 39, Code 39 Full ASCII, Trioptic Code 39, Code 32, Code 93, Code 11, Matrix 2 of 5, Interleaved 2 of 5, Discrete 2 of 5, Codabar, MSI, Chinese 2 of 5, GS1 DataBar variants, Korean 3 of 5, ISBT Concat