Features: 1.Adopts A+ grade chip for faster and more stable data transmission, 8?13mb/s writing speed, 13?25mb/s reading speed. 2.High speed USB flash drive, support for Windows 98/Me/2000/XP, for Mac OS 9.x/ for Mac OS X/for Linux2.4.x. 3.Ideal for backup of files, videos, etc. just plug and play, no need any driver. 4.High?quality zinc alloy shell, sturdy and reliable, waterproof and safe to use. 5.Compact size and large available capacity, convenient to use and can be carried freely. specification:Item Type: USB Flash Drive Material: Zinc Alloy Type: Drive Free Support System: (Above for Windows98) support for Windows 98/Me/2000/XP, for Mac OS 9.x/ for Mac OS X/ for Linux2.4.x Interface: USB2.0 Computer: Suitable for IBM PC, for MAC PC or laptop, etc. Speed: Maximum writing speed 8-13mb/s, Maximum reading speed 13-25mb/s Application: Backup files, videos, etc. Operation: Plug and play PackageList:1 x U Disk 1 xRoundKey Chain 1 xMicro USB Adapter NoteThe displayed capacity is different from the nominal capacity because the calculation method is different. Manufacturer Standard: 1GB / 1000MB / 1MB = 1000KB Regarding Available Capacity: 4GB =Approx.3.4GB?3.8GB 8GB=Approx.7.4GB?7.6GB 16GB=Approx.14.5GB?15.5GB 32GB=Approx.28GB?30GB 64GB=Approx.58GB?60GB 128GB=Approx.119GB?124GB 256GB=Approx.249GB?250GB 512GB=Approx.498GB?500GB