Product Details  promotional wristband usb flash memory,bracelet usb drive,usb2.0,customized logo printing is available  USB 1.1/2.0 complaint,hot plug and play no external power is required,by usb bus directly hight capacity:128mb,256mb,512mb,1gb,2gb,4gb,8gb,16gb write / delete protection switch more than 10 years data retention high transferring rate operation system requirement:windows98 SE/windoes ME/windows 2000.windows XP/Mac OS 9.X or above .linux kernel2.4 or above easily portable