User Agent String.Com 

User Agent String explained :

Opera 10.00
Opera	Name : Opera
9.80	Opera version -> old version, for compatiblity reasons only. See Version below
X11	X Window System a windowing system for bitmap displays
Linux i686	Operating System: Linux running on a Intel Pentium Pro CPU
U	Security values: N for no security U for strong security I for weak security
en-GB	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) en-GB = English - Great Britain
Presto	Layout engine for Opera
2.2.15	Presto version
Version	Browser version
10.00	Version 10.00
First visit:	2009.07.22 12:00
Last visit:	2020.02.06 10:21
All Opera user agent strings