Kingston DTTC/4GB Flash Memory 4GB Terra Cotta DataTraveler -Limited Edition (Gold) Safeguarded  includes SecureTraveler security software for Windows Enhanced  for Windows ReadyBoost on Vista-based systems Capacities 4GB Dimensions  2.78" x 0.78" x 0.39" (70.6mm x 19.8mm x 0.39mm) Fast  data transfer rates of up to 15MB/sec. read and 7MB/sec. write