"plug-and-play simple operation portable personal storage specifications: size:(lxhxw):60mmx28mmx30mm weight :13g operation voltage :dc5v+/-5% though usb port memory capacity:128mb,256mb.512mb,1g ,2g optional,usb 2.0 or 1.1 available. operating enviroment : os:windows 98/98se/me/2000/xp(pc with built-in usb ports). linux2.4 or higher .mac os 9.0 or higher cpu:pentium ,166mhz or above required hard disk space:3mb or more interface:usb 1.1 & 2.0 (connect to pc usb port directly) "