Wi-fi emitter keeps burglars locked out
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Burglar alarm uses wi-fi to see intruders

A new type of intruder detector is on show at the CES expo, which uses wi-fi signals to detect if a burglar has broken into a home.

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