The built - in GPS function even calculates the user's exact location in remote mountain valleys, using microwave signals from satellites that send information on their position to earth. (sciencedaily.com)
Some inquiry has also focused on the possible use of microwaves, harking back to the Moscow Signal, an episode from the 1970s in which Soviet intelligence beamed microwave signals into the US embassy in Moscow to activate a passive receiver hidden in the office of the United States ambassador, officials said. (businessinsider.com)
At its heart are five small loops of superconducting metal that can be manipulated by microwave signals. (sciencemag.org)