The cyberpunk mouse from the dystopian sucky cyber future where the megacorporations have abandoned the research into ergonomics in search of greater profits...
...what do you mean it's a product on market today?
Radar is basically the same thing as a flashlight. If you want to hide from someone's flashlight you have two options: absorb the light with a material (such as VantaBlack), or reflect the light away from the transmitter. The old solution was to do the latter, which is why the F-117 has odd angles: to bounce the light away from the transmitter.