How to cite a physical product?
In the example given, you are citing the specification, not the device.  The same is true of the Ferrari.  You are going to say something(s) about it, such as horsepower or wheelbase.  So, find and cite the specification(s) needed.

Edit: For the TrueRNG, you cite the web page, if that's the best information available, using whatever your discipline's citation style requires for a web page.  You're still citing the source of the information, not the physical object.

If you actually examine a physical product, e.g. reverse-engineer TrueRNG, then you describe the object you examined and the findings of your examination.  So, "I disassembled TrueRNG model ABC, serial number XYZ, and measured the actual entropy generated by the frammistan module using Someone's Method and determined..."  Similarly if you measure the acceleration of that Ferrari.  (I don't think that's the question you're asking, but that's what the title implies.)