4 Gb Metallic Memory Keychain USB Drive Data: an store any type of digital files, including personal files, photos, music, applications Storage Capacity: 4 Gb Plug-N-Play & USB 2.0 compliant Platform Supported: Windows Vista/XP/2000/ME, Linux with Kernel 2.4, and MAC OS X or higher. No drivers are needed for the above operation systems (only Windows 98 requires a driver-drivers available by special request only). Exterior: Real S&W 500 Caliber Brass Casing and Slug (All metal) Interfaces: 1 x 4-pin Type A Male USB 2.0  USB