Hi shuryga, Welcome. There are so many different mouse makers, some seem to work fine...others, not so much. I'm not sure which category your Prestigio falls into. Is your tablet seeing your mouse? If you've turned on Bluetooth in Settings and made your tablet visible (three wee buttons top right corner), your tablet should find the Prestigio when you hit search for devices. Or at least that's how it works in theory. Only other thing I've seen suggested, do a cold boot and then try again. Cold boot, dock your tablet and unplug...turn off. Turn back on by holding down both Power & Volume Down buttons, keep holding till 4 symbols pop up on your screen...release, your tablet will cold boot--you won't lose any info. Then try going into the bluetooth setting again and see if it can find/pair with your mouse. If not, it could be that mouse is not compatible with the tablet, it still could work with other devices, as you've mentioned...perhaps not with this one. Wonky yea.
-moving this thread to the 300 Accessories Forum, cheers-