> I'd still love to see wiring diagrams or explanations how it actually works. Which kind of circuit do they use?

I'd like to see that too, but I don't think we will. I suspect it's a magnetic switch and I'm also curious which lines it cuts.

FWIW, you can still get some audio from an accelerometer if you can get it to report data with a high enough frequency.

Not sure what you mean about iPhones, their information does not mention the iPhone (and I would not expect it to).