This Mini Micro SD Card Reader compatible with USB 1.1 and 2.0. No external power required, just powered by USB connector. Mini and compact design T-Flash Card Reader is easy to carry with string design. Description:USB TF T-Flash Micro SD Memory Card Reader with StringThis Memory Card Reader provides convenient data exchange for MP3, PDA, digital camera, mobile phone, etc.Function as a portable Micro SD / TF card to USB adapter.Read and write Micro SD flash memory card.T-Flash Card Reader is fully compliant with USB V2.0 specification.plug and play, SD Memory Card Reader is easy to install.Read / write speed is 18Mb/sec.USB bus powered, no external power is needed.USB Card Reader comes with a string for easy to carry!No driver is needed for Windows 2000, ME, XP, and Vista.LED operating light indicator.Size:Size: 1 1/8" x 1 /2" x 1/16"(L*W*H).Starp length: 2 1/4"Weight: 9g.Package Included:1 x Memory Card Reader.