Features: 1.High?speed transmission, using A+?level chips, faster and more stable transmission. 2.Selected zinc alloy materials shell, strong and durable, has a long service life. 3.With safety waterproof function, there is no need to worry about file loss in the flash disk, which is very practical. 4.Small body and large capacity, easy to carry and store, convenient to use and with good performance. 5.There are 16GB, 32GB, 64GB, 128GB 4 s to choose from, which can meet your different needs. specification:Item Type: U Disk No driver required (for Windows98 or above), support for Windows 98/Me/2000/XP/OS X 9.x/OS X /Linux2.4.x; Interface: USB2.0 Material: Zinc Alloy Computer: For IBM PC/OS X PC or laptop, etc. Speed: The maximum writing speed is 8-13mb/s, the maximum reading speed is 13-25mb/s Application: Backup files, videos, etc. Operation Steps: Plug and play The displayed capacity is different from the nominal capacity because the calculation method is different Manufacturer Standard: 1GB / 1000MB / 1MB = 1000KB Regarding Usable Capacity: Please Note The Memorandum Regarding Storage Product Capacity: 4GB =approximately 3.4GB-3.8GB 8GB=approximately 7.4GB-7.6GB 16GB=approximately 14.5GB-15.5GB 32GB=approximately 28GB-30GB 64GB=approximately 58GB-60GB 128GB=approximately 119GB-124GB 256GB=approximately 249GB-250GB 512GB=approximately 498GB-500GB PackageList: 1 x U Disk 1 x Microusb 1 x Round Keychain