Add an RS-232 serial port to your laptop or desktop computer through USB (Universal Serial Bus). * Simple installation & operation provides robust serial connectivity to legacy PCs * Drawing power from the USB (Universal Serial Bus) bus saves the hassle of carrying an external power adapter for this add-on serial port * Extensive list of compatible operating systems makes this device perfect for almost any RS232 application The Star Tech.com ICUSB232 1ft USB (Universal Serial Bus) to DB9 RS232 Serial Adapter Cable lets you connect DB9 RS232 serial devices to your Mac or PC laptop or desktop computer through a USB (Universal Serial Bus) port, as though the computer offered an onboard DB9M connector. A cost-effective solution that bridges the compatibility gap between modern computers & legacy serial peripherals. Backed by a Star Tech.com 1 year warranty & free lifetime technical support.