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Vayyar, a company based in Israel, has developed a radar sensor which can be connected to your smartphone. BBC Click have been taking a look at what it can do:
Read more, and watch the video here: http://www.bbc.co.uk/news/technology-38608135
It can detect very subtle movements and the direction they are coming from.
The technology could be used as an alert system if a person falls over and is unable to get up or they stop breathing.
The sensor has also been fitted into a phone attachment which allows the user to "see" what is behind walls and could prevent accidental drilling through pipes and cables.
Read more, and watch the video here: http://www.bbc.co.uk/news/technology-38608135