... 3. Page up/Page down4. Built-in flash memory is optional (no memory/64/128/256/512/1024MB )III Operation System Windows 98, Se ... , Me, 2000, XP, Windows Vista, Windows 7, Mac OS, Linux IV Specifications: ... *14cm Weight: 15g(Without battery) Operation System: Windows 98, Se, Me, 2000, XP, Windows Vista, Windows 7, Mac OS, Linux USB Version: USB1 ...