Get a Microsoft Arc Mouse for $27.99 instead of $49.95. This mouse by microsoft is a wireless one but beyond this the main feature is that in the middle it is foldable – so this feature makes it great for portability. The sensor is a laser one providing you precisious movement. For the batteries you need AAA ones to get this mouse running. There is a total of 4 buttons on the mouse making it greater and easier to use. Click here to get yours !