USB-based pendrives are portable-storage devices that contain flash memory for the ultimate in personal data storage. Today however, these pendrives are around half the size of a pen, or less. They feature USB connectivity for a direct connection to any system with a USB port. Most feature a ring attachment point for your keyring/lanyard strap. Advanced features on some include weather resistant construction, encryption/security and a capless design. Premium pendrives can offer capacities of up to 1TB and super-speedy transfers thanks to USB 3.1 Gen 2 support. Often these drives can sustain over 250MB/s transfer speeds when reading and writing large files.