Features

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General
Model Name X500  M90  comfort x1500  B175
System Requirements Windows: XP, Vista, 7, Mac OS X v10.4, Linux Kernel 2.6  Windows XP  Windows: XP, Vista, 7, Mac OS x 10.5, Linux Kernel 2.6
Color Black  Black 
Controls 2  3 Buttons  2 Buttons
Part Number E5C12AA#ACJ  910-001795  H4K66AA  910002635
Connectivity and Power Features
Power Source USB  1 x AA Battery
Warranty
Warranty Summary 1 Year Limited Warranty  3 Years Limited Domestic Hardware Warranty