The ICUSB232SM3 3ft USB (Universal Serial Bus) to Serial Adapter Cable lets you connect DB9 RS232 serial devices to your Mac or PC laptop or desktop computer through an available USB (Universal Serial Bus) port, as though the computer offered an onboard DB9M connector. Unlike typical USB (Universal Serial Bus) to serial converter cables where the conversion takes place at the DB9 end of the cable, the Star Tech.com ICUSB232SM3 features a converter chip on the USB (Universal Serial Bus) end. Converting at the USB (Universal Serial Bus) source overcomes the 15ft. technical limit of USB (Universal Serial Bus) cables, allowing for a much greater serial DB-9 extension cable (50ft.+ is possible depending on the application), should it be necessary for a given setup. Simple to install & use, this USB (Universal Serial Bus) to Serial adapter provides a cost-effective solution that bridges the compatibility gap between modern computers & legacy serial peripherals.