USB Mouse works, but ...

[Popov Maxim]

I have a wireless mouse and keyboard. Mouse works, but not very well
... When i move it, the cursor moves too, but with very slow and with
little "jumps". If i move it faster, the jumps are bigger ...
Clicks don't work. To do a click i must press the button, then move it
on few pixels on right or left.
dmesg says:

dmesg | grep kbd
ukbd0: MOSART Semi. Wireless Keyboard & Mouse, rev 1.10/1.00, addr 2, iclass 3/1
kbd0 at ukbd0

dmesg | grep ums
ums0: MOSART Semi. Wireless Keyboard & Mouse, rev 1.10/1.00, addr 2, iclass 3/1
ums0: 5 buttons and Z dir.

ps -aux | grep mouse
root   275  0,0  0,2  2420   908  ??  Ss   18:37     0:00,05 /usr/sbin/moused -