... , page up and page down for PowerPoint presentation. Flash memory (64/128/256/512/1024MB optional) can be built in the ... 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 ... *14*14cm Weight: 15g(Without battery) Operation System: Windows 98, Se, Me, 2000, XP, Windows Vista, Windows 7, Mac OS, Linux USB Version: USB1 ...