The trick is, you can't buy this particular one because you just don't know what it does exactly. I have tried to make a cable like that in the past be the bes

The trick is, you can't buy this particular one because you just don't know what it does exactly. I have tried to make a cable like that in the past be the best I got was to hide the electronics in what looked like a bead. Unfortunately, this only really works with USB-B devices where users are already used to having beads on the cable which for practical purposes limits attacks to printers and older scanners.