The YES Logger Package contains a 2GB SD flash card, 6 ft USB cable, USB multi card reader, 512 MB USB thumb drive with the YESViewer Software and the YESViewer Software Manual. The SD card should be installed in the YES monitor and configured to collect data. The flash card reader can be used to download the data form the SD card onto a computer. Or the cable can be used to connect the YES IAQ monitor to the computer and download the data. The USB drive has the YESViewer Software program file for installation onto a PC and it allows you to configure the YES IAQ instrument, view real-time values of all sensor channels in tabular and graph views, manipulate the graphs for better analysis, and back up the data.