The Crystal POS is part of the Crystal Software Group solutions called the Crystal Online Retail Solution. These include the Crystal POS on Android, the Crystal POS on Windows, the Crystal Back office on Windows, and the FORMULA ERP on the cloud, the only solution from the front to the accounting, money and tax systems. The Crystal POS on Android is a simple Point of Sale program that targets users without the need to input any character by keyboard anymore. We start to store the barcode databas