DTech USB to Serial Adapter Cable 16 ft DB9 Male RS232 to USB Cord with FTDI Chip Supports Windows 11 10 8 7 Mac Linux (5m) 16ft USB to DB9 serial male cable auspowers_batchsix They feature removable alligator clips Color:Black 4 Pack They feature removable alligator clips that attach to wires and other conductors SPDT Control Type Single Pole Double Throw (SPDT) is a control type that the switch has only a single input terminal to two output terminal By converting a USB Connection to a DB9 Serial Connection you can make use of older equipment that still relies on a DB9 Serial Connection so there is no need to worry about upgrading to newer equipment letting you free up your existing serial port