***** **********Best Quality Guranteed. *****USB to RS232 adapter connects from the USB-A port of a computer to a device with a female DB9 port; Bus-powered Serial to USB adapter 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 connector of the RS232 to USB adapter will not mate with the equipment port*****SIMPLE INSTALLATION of the USB Serial adapter using the drivers available for download from; Connect a null modem adapter (sold separately) to directly connect two computers with serial cables*****WINDOWS & MAC COMPATIBLE USB to Serial for Windows 2000/XP/Vista/7/8/10 and macOS 10.6 and above; The 9 pin to USB adapter may require additional proprietary software some equipment models*****RS-232 COMPATIBLE DB9 to USB adapter is required for many types of equipment including a CNC machine, GPS, telescope