I have this mouse, and it's great to use - the nano receiver is tiny so it's perfect for netbooks. £20+ elsewhere.
* Ergonomic laser mouse for right-handed users with secure 2.4 GHz wireless technology
* Nano USB-receiver can remain in the laptop or stored in the mouse when on the move
* Laser sensor for precise work
* Simple toggle of the resolution via an easily-accessible switch on the top of the mouse
* Wireless freedom with 2.4 GHz wireless technology offering up to 5 m range and interruption-free transmission
* Ideal for use on the move with an energy-saving On/Off switch
* Plug & Play for easy start up with no software installation