I have one of these - great little mouse and the battery life is incredible. Ideal for netbooks/notebooks. £17 + elsewhere.
* 3 programmable buttons.
* Scroll wheel.
* 4-way scrolling.
* Suitable for left and right handed use.
* 2.5ft range.
* Includes battery (uses 1 x AA).
* Battery life up to 6 months.
* Snap in receiver automatically turns off mouse when snapped in.
* USB connectivity.
* Compatible with:
* Windows 2000/XP/Vista.
* Mac OS 10.1 - 10.3x.
* Manufacturer's 3 year guarantee.