InstallerParts USB to Serial Adapter USB Male/DB9 Male FTDI Chipset &ndash; Mac and Windows Compatible The USB to Serial Adapter is USB Powered and Requires no External Power Source Supports USB transfer speeds up to 500kbps The USB Serial Adapter is Vista, Win7, and OS-X Compatible Compliant with the Standard Specification of USB 1.1 Plug-and-Play and Hot Swap Support