User Agent String.Com 

User Agent String explained :

Opera 7.21
Opera	Name : Opera
7.21	Opera version
Windows NT 5.1	Operating System: Windows XP
U	Security values: N for no security U for strong security I for weak security
en	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) en = English
Last visit:	2014.02.12 03:15
All Opera user agent strings