DTECH 4 Feet USB to RS232 DB9 or DB25 Serial Port Adapter Cable with FTDI Chip Supports Windows 10 8 7 and Mac The Serial to USB adapter connects a 9 pin or 25 pin RS232 serial device to your computer through a USB port, as though the computer offered an onboard serial port. The USB to RS232 cable is built with FTDI chip to support you the widest possible OS compatibility and reliable data communication. The integrated 4-foot (1.2 meter) cable allows it to be connected directly from the serial device to the computer without requiring additional cables. This saves you the annoyance of needing an extra adapter. Plug and play creation of a COM port support enables you to add and remove this adapter without having to reboot the computer. USB powered; No external power adapters needed. High quality gold plated connectors provide you faster and more stable data transfer, compared to those nickel plated ones.