1． Support USB V2.0 full speed specification and USB device class definition for mass storage 
2． Plug and play the USB interface without external power supply
3． Adopting high speed USB2.0 interface
4． Have LED lamp can show literacy status, support hot swaps, not insert CARDS, LED lamp, already insert CARDS, LED lamp long bright.
5． Products subject to metal shell, the outward appearance is exquisite.
6． Can use speaker and microphone