Bought in the late 2010s.
Mentioned at: raspberrypi.stackexchange.com/questions/3867/ssh-to-rpi-without-a-network-connection/53823#53823
Official product page: www.dsdtech-global.com/2017/07/dsd-tech-usb-to-ttl-serial-converter.html
Sample Amazon link: www.amazon.co.uk/gp/product/B072K3Z3TL