You place the product to become scanned with its barcode face down over a conveyor made of some transparent product. If you'd like some really serious barcode scanner wi-fi range, appear no even more. The NADAMOO Wi-fi Barcode Scanner has among the list of longest wireless ranges for barcode scanners https://barcodescanning68899.luwebs.com/27026032/a-review-of-sap-barcode-scanning