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I'll never forget the thread here on ATS of someone proving that the bluetooth in their car was listening to them while they were having conversations with their spouse in their garage while their phones were nowhere near them. They turned off their other electronics, placed them on the opposite end of the house, and by the time they turned them all back on, they were getting ads popping up that were related to their personal conversations in the garage.
originally posted by: GrumpyPants
Research the ZN414 Ferranti integrated circuit.