crystal usb flash drive 1.Capacity:512MB/1/2/4/ ... time:2K in 3 days 4.Custom logo USB flash drive 1.Specification Available Capacities: 64MB,128MB,256MB,512MB ... 2GB,4GB,8GBCompatibility: PC or Notebook with a USB interfaceOperating Systerm: Windows Vista/XP/2000/ME/98 ... 98/95,Transfer Rate: High Speed USB2.0 USB 1.1 CompatibleDimensions L*W*H: 8.3 ... 0.8(210.82mm*20.32mm Unique model crystal usb flash drive