Add an RS232 DB9 or DB25 serial port to your laptop or desktop computer with this Plug-and-Play USB to Serial adapter cable. The ICUSB232DB25 3-foot USB to RS232 Serial adapter cable lets you connect 9-pin (DB9) or 25-pin (DB25) RS232 serial devices to your laptop or desktop computer through a USB port, as though the computer offered an onboard serial port. This high quality USB/RS232 Serial adapter cable is a cost-effective solution that bridges the compatibility gap between modern computers and legacy serial peripherals.