Bifrost 1D 2D Mini Barcode Reader Portable QR Bluetooth Wireless Barcode Scanner Support Scan PDF417 DataMatrix BS-2897[Black]

Poor quality. Have ordered two of these, both are now defective. They just stop scanning. Also doesn't scan the PDF barcodes as specified. Contacted manufacturer, an endless string of emails asking 100 questions, then quit answering.

It 's like a toy but it 's work great

There are no instructions.