"Our internet-connected devices use a proprietary radio system, which links the alarms together," says Nick Rutter, co-founder and chief executive of FireAngel. The connected alarms can send push notifications to users' phones via their home internet router.
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The surface-to-air missiles, which are capable of shooting down aircraft and ballistic missiles, will be located on Yonaguni – Japan’s westernmost island – by March 2031, Shinjiro Koizumi said.
SpaceX has not responded to emailed requests from BBC News for comment. The researchers also sent their findings to the company but did not receive a response.