The Lenovo Optical Mouse (06P4069) utilizes optical tracking technology for precision control.
Features:

•Integrated wheel scrolling device 
•No mousepad required; it works on many types of surfaces 
•No mechanical ball to get dusty or dirty 
•Full-size shape that fits comfortably in either hand 
•Same mouse that is included with select ThinkCentre desktop systems 
•Business Black color complements ThinkCentre and ThinkPad systems 
•Scroll wheel also acts as programmable third mouse button 
•Attaches via USB port 

Physical specifications:
 
Weight: 94g 
Height: 32mm
Width: 54mm 
Depth: 114mm