Winten WT-UPI3.0-256GB USB 3.0 flash drive 256GB High speed (up to 110MB/s), USB 3.0 drive with rotating stainless shell design High speed up to Read :110Mb/s Write:70Mb/s 256GB Memory - Read :110Mb/s Write:70Mb/s Support OS:Windows Me/2000/XP/Vista/7/8 Linux Kernel2.4 /MAC OS 9.x Warranty time for 1 year Interface :USB1.1/2.0/3.0 / Plug and Play 6cmX0.6cmX2.2cm LxWxH , Weight :23g