Feature: 1. Unit measures 2.17 x 0.75 x 0.43 inches (55 x 19 x 11 mm). 2. Capacity options: USB 2.0: 1GB 2GB, 4GB, 8GB, 16GB, 32GB 64GB. USB 3.0: 8GB 16GB 32GB 64GB. 3. Sold in a secure cardboard organizer box. Clean and neat. Easy for maintanence. Tech Specifications: Chip: Grade A, original brand. Interface Type: USB 2.0 and USB 3.0options backwards compatible to Interface Type: USB 2.0. USB 2.0:Writing speed: 5mb/s-6mb/s; Reading speed : 8mb/s-10mb/s. Interface Type: USB 3.0. Writing speed: 40mb/s-45mb/s Reading speed: 10mb/s-15mb/s Compatibility: Desk PC, Laptop, Mac, Tablet, Speaker with USB port. Operating System : Windows 7/Vista/XP/2000/ME/NT, Linux and Mac OS. Operating Temperatures : 32o F to 140o F (0o C to 60o C). Storage Temperatures: -4o F to 185o F (-20o C to 85o C). Package Includes: 1 x usb flash drives Friendly Tips: 1. Some of the listed capacity on a flash storage device is used for formatting and other functions, thus is not available for data storage. As such, the actual available capacity for data storage is less than what is labeled. 2. FAT32 is factory default drive format, which is read/write compatible with Windows and Mac OS; while NTFS is compatible with Windows but semi-compatible with Mac OS. Please format it properly if need. Services: Thank you for choosing Zhongyuanmaoyi products. If you need any assistance, or are not happy with Zhongyuanmaoyi products by any chance, please do not hesitate to contact us. In every customer relationship, Zhongyuanmaoyi strives to be a trusted partner and seeks to achieve 100% customer satisfaction.