User Agent String.Com 

User Agent String explained :

Opera 10.00
Opera	Name : Opera
10.00	Opera version
X11	X Window System a windowing system for bitmap displays
OpenBSD amd64	Operating System: OpenBSD running on a AMD 64 bit processor
U	Security values: N for no security U for strong security I for weak security
ru	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) ru = Russian
Presto	Layout engine for Opera
2.2.0	Presto version
First visit:	2008.12.11 07:18
Last visit:	2018.07.29 07:31
All Opera user agent strings