Features: 1) USB 1.1/2.0 compliant, hot plug and play. 2) No external power is required. 3) Driver is unnecessary above windows 98. 4) Used as ball pen which can be fluently written., with exchangeable standard pen core. 5) Pen shape USB flash disk, very fashionable and popular. 6) Capacity: 32MB-1GB. 7) Packing: gift box