... USB specification 1.1 / 2.05) Plug-and-play; no external power supply required, USB bus-powered6) Common Size is from ... ) Various colors optional, meets personal favorites very well14) usb flash drive daily output: 20Kpcs Product Specification Capacities:64MB,128MB,256MB,512MB ... any USB port, it looks and functions just like another hard driveLED Light:Dual LED indicates power and busy,read/writeShock ...