GM901-B Mini Barcode Scanner Module 1D 2D Bar Code Reader QR Code Reader Module USB UART Interface Matching multiple lenses, multiple code reading modes, large development space Compatible with major mainstream systems: complete serial port development instructions, meet various interactive control needs, support multiple languages Stamp hole design, large development space, flexible application and easy integration Matching multiple lenses, ingenious and flexible application, free adaptation Rich code scanning modes, multiple scanning methods to meet different application needs Name:Barcode Scanner Module Communication interface: TTL-232, USB (HID-KBW, virtual serial port) (The product appearance and printed words depending on the batch, but this does not affect use) Colour:As Shown Material:PCB Package Contents: 1 x Barcode Scanner Module Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.