Amazon Echo speakers can now track whether someone is in the room using invisible signals

SOME Amazon Echo speakers will now be able to detect when a person is in a room.

Fourth generation Amazon Echo speakers and new Echo Dots will use ultrasound technology to detect the presence of a person.

This feature could allow your speaker to turn lights on and off for you as well as other useful functions.

You could even set it so a Fire TV turns off when you leave the room.

You will need to enable the feature in the Alexa app.

It's found under Motion Detection if you have a compatible Echo device.

The feature can be turned on and off as you please.

The Echo devices with this feature don't have cameras so they'll rely on emitting an inaudible ultrasound wave to check whether you're there.

This soundwave will reflect off nearby objects and allow the speaker to recognise a human.

Amazon first mentioned the feature at its fall hardware event earlier this year.

It's similar to the motion-sensing feature that comes with the Echo Show.

However, that device can rely on cameras to detect you leaving or entering a room and not a soundwave.

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