1.2.4G Wireless Technique.                     
2.Free moving in 15m,Auto Power saving function                              3.Resolution :800DPI~1600 DPI exchangeable.                                 
4.Product Size:102*61*38mm                              
5.Work with 2*AAA battery  Frequency:2.4-2.48                     
6.Working on any surface except glass and mirror                            
7.Compatible with Windows98/ME/2000/XP/VISTA