Featuring the SuperSpeed USB3.1 (Gen 1) interface and extremely large space up to 256GB, the B21 can not only let users to store all their favorite media and important files but also enables super-fast data transferring speed which is ten times faster than USB 2.0 drives. Features: High capacities up to 256GB SuperSpeed USB 3.1 Gen1 data transfer interface Cap-less design with retractable USB connector that can prevent cap-loss problem Strap hole design to enable easier storage and carrying SP Widget, the exclusive free-download software, provides powerful functions such as data backup & restore, AES 256-bit encryption and cloud storage for efficient data management.