1) Interface: Hi-Speed: USB1. 1(or USB2. 0) Power Supply: USB bus power(no external supply) Transferrate: Reading23MB/sec(max)Writing 17MB/sec(max) Operatingsystem compatibility: Win98/SE/ME/2K/XP, Mac OS 9. 0and higer. SmallBox Size: 13*10*2. 7(CM) BigBox Size: 52*31*29(CM) 100PCS/box 2) Capacity: 128MB 256MB 512MB 1GB 2GB