Capacities available: 1GB, 2GB, 4GB, 8GB, 16GB, 32GB, 64GB, 128GB, 256GB USB chips High quality real chips: Toshiba /Samsung/Hynix Operation system: Windows 10/8.1/8/7/Vista/XP/2000/ME/98 and Mac OS 8.6 or above Reading speed: 15-28MB/S Write Speed: 5-9MB/S Colors: Customer's colors are available Power: No external power supply required, USB bus-powered. Plug-and-play support USB specification: Compliant with USB