Adopt super stable level A Flash chip. USB main interfacespeed rate can reach 12Mb/s. Can rewrite for million times data can remain more than 10 years. Need not the outer power supply. Thumb size, only weigh 11.4 gram, legerity and convenient by taking. Under WinMe/Win2000/WinXP system no need drivers. Auto-guide system operate, be the same with Bios Be provided with the super-function such as hardware encrypt, document Encrypt and write-protect Quantity:80PCS N.W.:4.60KGS G.W.:5.50KGSPackingize:50.5*28.3CM