The ICUSB232DB25 3-foot USB to RS232 Serial Adaptor 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. A cost-effective solution that bridges the compatibility gap between modern computers and legacy serial peripherals, this high quality USB/RS232 Serial Adaptor cable is backed by StarTech.com's 1-year warranty and free, lifetime technical support.