***** **********Best Quality Guranteed. *****USB C to RS232 adapter connects from the USB-C port of a computer to a device with a female DB9 port; USB bus-powered connects to devices for configuration or programming*****MALE TO MALE serial to USB provides a convenient solution for communicating with equipment that require a DB9 connector; Use a DB9 mini gender changer (sold separately) if the fixed hex screws will not mate with the equipment port*****SIMPLE INSTALLATION of USB C to serial adapter using the drivers available for download from Matters; Connect a null modem adapter (sold separately) to directly connect two computers with serial cables*****WINDOWS & MAC COMPATIBLE with the latest OS versions; Some equipment may require additional proprietary software that may limit the OS compatibility*****RS-232 COMPATIBLE USB C serial is required for many types of equipment including a CNC machine, GPS, telescope, Set-top box, Cisco network switch, sewing machine and more