StarTech.com 1ft/30cm USB to Null Modem Serial Adapter Cable, COM Retention, FTDI, RS232, Changeable DB9 Nuts/Screws, Windows/macOS/Linux - Add a DB9 RS232 null modem serial port to a desktop/laptop using a USB-A port; Changeable DB9 Nuts/Screws; Nuts pre-installed; Screws included for device/cable