Item No.: UD5000 Product Name: USB Keychain Description: 1) USB 1.1/2.0 compliant, hot plug & play 2) No external power is required, powered by USB bus directly 3) Compatible between different operating systems 4) Electronic storage device, no mechanical components, shake protection, electromagnetic wave protection 5) Write/delete protection switch 6) PC compatible, Mac compatible with USB port8) optional capacity:16M-1G dimension:4.0*1.8*1.0cm