‘Wi-Fi radar’ spots motion through walls

The Wi-Fi radio signals found in most homes can now be used to pinpoint your movement, when they are sniffed by a system being developed by researchers in London. It can even detect motion through a foot-thick brick wall.The Wi-Fi radio signals found in most homes can now be used to pinpoint your movement, when they are sniffed by a system being developed by researchers in London. It can even detect motion through a foot-thick brick wall.






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