An excellent mouse, small and compact. If your notebook (desktop) already supports bluetooth, you don't need to use the dongle with the mouse. There is a small button underneath the mouse - press it in, and then your notebook will deteck the mouse.
The documentation is sparse to put it mildly! There is practically no help is what it does - have a look at some of the reviews on the internet and you'll learn what button does what. Also, it runs great on Vista but you MUST download the latest drivers from Microsoft, rather than install the supplied ones.
The small case is a cracker! If you don't need the dongle, take it out, leave it at home and the space left is a perfect fit for two replacement AAA batteries should you run out. :-)
The default sensitivity is extreme - the mouse speeds around the screen, and even a slight movement of the scroll button makes pages whizz by. Fortunately the sensitivity can be controlled in the latest software in the Control Panel. The scroll button also has lateral movement - move to the left and it will go back a screen in IE, go right and the screen will scroll sideways.
The presentation ability is impressive - including a lasar pointer.
All in all, if you need this functionality, this is a great product and highly recommended.