Add two RS-232 serial ports to a laptop or desktop computer with an available USB-A portAdd RS-232 serial communication support to USB-A compatible DTE (Data Terminal Equipment - e.g. desktop or laptop) with this 61 cm straight USB to serial cable adapter with 2 ports.Serial port expansionThe dual port USB serial adapter provides two RS-232 DB/DE-9 (male) connectors to a desktop or laptop computer via a single USB Type-A port. Connect the adapter to a serial device with pre-installed and removable DB-9 nuts or install the included DB-9 thumbscrews for compatibility with other serial peripheral devices or cables.LED indicatorsLED data transmission and reception indicators for each port on the adapter provide real-time monitoring of port activity. The USB LED indicates when the adapter is connected to the desktop or laptop computer. All LEDs facilitate diagnostics and troubleshooting.Seamless connectionThe adapter is compatible with Windows, macOS, ChromeOS and Linux. Drivers are automatically installed on Windows 7 and newer, macOS 10.15 and later, and Linux. The USB to RS-232 adapter features COM retention, which automatically reassigns the COM port value if the cable is disconnected and reconnected, or if the system is rebooted.Built to lastThe rugged TPE construction and Level 4 ESD protection (15 kV via air and 8 kV via connector) increase the reliability and longevity of the USB to serial adapter. Copper shielding minimizes electromagnetic and radio frequency interference (EMI and RFI). Gold-plated contacts improve signal conductivity. The included mounting bracket allows the serial adapter hub to be mounted on a desired surface.The StarTech.com Advantage