Wi-fi emitter keeps burglars locked out
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CES 2017: Hidden wi-fi signals act as burglar alarm

8 January 2017 Last updated at 00:08 GMT

A new type of home security system has been developed that uses wi-fi signals to detect if an intruder has broken in.

Richard Taylor found out more about the system at the CES tech show in Las Vegas.

Follow all our CES coverage at bbc.co.uk/ces2017