RS232 to USB adapter cable with DB9 serial connector lets you connect RS232 devices to your computer's USB port. Supports data transfer speeds up to 230 Kbps-double the speed of a built-in serial port Automatically reassigns COM values to each port to avoid additional configuration USB-powered, so no bulky or obtrusive external power supply is required. Compatible with Windows, Mac and Linux-works with most computers. Double shielding protects against EMI/RFI line noise that can distort or destroy data