Hello,
The russian market is special, "closed". In Russia, there without some features : audio, Wacom, etc.
Europe and the rest of the world :
M92 : standard model ->
http://ereader-store.de with audio and Wacom.
M92 Black Pearl : Poland ArtaTech. Software modified. Updates from this forum are not compatible with the device, except if you use a specific tool but you can loose the warranty.