3 Ports Hub /Multi-Card Reader 1) Combo USB 2.0 Multi Card Reader +3 Port Hub 2) Full compliant wit USB 2.0 high speed 3) Backward compatible with USB 1.1 4) Full Plug & play and hot swapping support 5) LED indicator for power and access 6) Instant connection to computer through USB port 7) Powered by USB connection cable.No external power required Compatible with:MS MG Pro,MS MG Duo,MS,MS Pro,MS ROM,MS Select,MS Pro Duo,MS MG Pro Duo,MS HS MG Pro, MS HS MG Pro Duo,MS MG, MS Exteme Pro,MS Micro(M2),SD,SDHC,Mini SD,Micro SD(T-Flash),SD Exteme,MMC Ultra, RS-MMC,MMC 4.0,HS RS-MMC.