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USB to (3.3v) Serial adaptor for use with the Raspberry Pi with a pinout designed to plug straight onto Pi GPIO pins (26 or 40 pin).
Its a low cost no fuss adaptor which uses built-in USB-CDC drivers on most modern operating systems (Win10/Linux/Mac OS X/Android).
To aid orientation the Triangle/Square should be plugged into Pin 1 onto the Pi GPIO header.