Specifications : Interface: Supports hot plug & play, High speed USB 2.0 port Read Speed: 18MB -24MB/second Write Speed: 3MB -6MB/second Power: No external power required Compatibility For Macs and PCs,Support all current computer systems Speeds vary depending on types of file being transferred and computer configuration. About Capacity : Due to different ways of computing, or the existing bad block, or some built-in software , the memory capacity of the usb flash drive may show less on the PC . And the more capacity is, the more deviation is. Note: Since the U disk itself occupies a certain space, the storage space is displayed on the computer smaller than the mark storage space. Storage Industry Area calculation method: 1GB=1000MB=1000*1000KB=1000*1000*1000B Operation System calculation method: 1GB=1024MB=1024*1024KB=1024*1024*1024B So 1GB storage in OS shows as: (1000^3)/(1024^3)≈0.93GB 8G=approx 7.4GB - 7.6GB 16G=approx 14.0GB - 15GB 32G=approx 28.0GB - 30GB 64G=approx 58.0GB - 60GB Note: 1. To avoid data loss or mechanical damage, do not turn off the computer power during transmission. 2. Do not remove the USB flash drive during use, otherwise data may be lost. 3. After using a USB flash drive, it is best to safely eject the USB flash drive on your computer, which will help to extend its storage life. 4. Please use FAT32 or exFAT to format the memory disk. Please do not format your USB flash drive frequently, otherwise the USB will be damaged easily. Package included: 1 x USB flash drive Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.