Baby monitor

A baby monitor, also known as a baby alarm, is a radio system used to remotely listen to sounds made by an infant. An audio monitor consists of a transmitter unit, equipped with a microphone, placed near the child. It transmits the sounds by radio waves to a receiver unit with a speaker carried by, or near to, the person caring for the infant.

Some baby monitors provide two-way communication which allows the parent to speak back to the baby.
Some allow music to be played to the child.
A monitor with a video camera and receiver is often called a baby cam.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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