Received one of these little guys today ... what a great mouse!  Small, wireless, optical, roller ... sweet.

Killer feature:  The small wireless receiver snaps into the bottom of the mouse for transport! AND turns the mouse off to conserve battery life.

This makes it great for people that travel ... less wires in you laptop bag ... and no worries on a plane because the mouse is off when not being used.  Fantastic.

This is a must have for mobile users.  Plus you get plenty of WOW factor with these little guys.

"Microsoft Mouse and Keyboard Hardware - Wireless Notebook Optical Mouse"