This tool allows you to lookup the specification of a Sony device including Xperia mobile phones, Playstations and accessories, cameras, lenses and Bravia TV's by entering the EAN or UPC code. Its the 13 digit number next to the barcode.
EAN or UPC number :
Click herefor an idea of what it may be worth (via previously sold items on eBay)
You can copy and paste the specs directly into your adverts and even link directly to them by adding "?ean=yourEAN" to the end of the URL, for example "serial-number-decoder.co.uk/sony/sony.htm?ean=7311271421627"
(replace with your own EAN)