Do you have collection of books or CDs that have barcodes? This app uses barcode scanner to scan and check in. When you lend the book or CD to other people, you then scan and check out. This provides a way for you to keep track of your books or CDs. At any time, you can know whether a particular book or CD is checked out or checked in. Tap scan to scan barcode. Tap Check In, Check Out accordingly. Tap Menu-Search to see all the data. Tap Export to save the data to sdcard as csv file.