the lanyard usb drives are driverless (except win98), no external power supply. the lanyard flash disk is small, light, shockproof and moisture proof. hot plug and play usb interface. available capacity of flash: 16mb, 32mb, 64mb and 128mb version 1.1. hi speed usb 2.0 can with the flash capacity: 128mb, 256mb, 512mb, 1gb and 2gb. ultra high speed : 256mb, 512mb, 1gb, 2gb. read speed of the flash driver: 11m bit/s write speed of the flash driver: 8m bit/s. mobile data storage and exchange. supporting windows 98/me/2000/xp, mac os. power consumption : less than 40ma when working. less than 300ma when idle. led indicator. the lanyard flash drive disk can be written above one million times. the flash memory can make 10 years data retention. storage media : flash memory.