*USB version 2.0 standard, compatible with USB version 1.1
*Sim card reader can read GSM sim card
*Two slots for card reader and one slot for sim card reader
*Supports Cards: Mini SD Card,Micro SD(T-Flash),SD,MMC,MMC Plus,RS-MMC(MMC Mobile), *MMC Card 4.0,RS-MMC 4.0(MMC Mobile 4.0),Sim Card
*Plug-and-play and hot swapping
*USB bus-powered
*Supports Windows 98SE, 2000, Me, XP,Vista & Mac OS 9.0
*Product size: 8.85 x 3.1 x 1.35cm