Abstract: A data collection system includes a data transfer device which is attached between a data transmitter device and a data receiver device, takes a copy of the data instantaneously passing therebetween, sends the same to the cloud platform over the GPRS, and provides reporting of the data collected in the cloud platform. In particular, a data transfer device which is positioned to the retail points of sales, can collect sales information of the product instantaneously in the digital media, in the real time, is attached between the barcode reader and the computer/cash register/pos system, characterized by taking a copy of the data while the data read through the barcode reader is being transferred to the computer/cash register/pos system, sending the same to the cloud platform instantaneously and reporting the data collected in the cloud platform.