There are two main parts for the baby monitor, one is used by parents and one is used by babies. The mom's side has a radio input for parents to listen to babies, while baby's side is a sound input to sense baby's sound by microphone and use transducer to send sounds to moms.
In baby's side, the transducer, electrical signal and amplified are powered into circuit board from adaptor, while parent's side have filtered, electrical signal and amplified to power into circuit board from battery. Hence, parents can move around with the baby monitor and listen to babies anytime they want.
The interesting thing we discovered in the baby monitor is that baby's side has LED lights to indicate the frequency of baby's side. Also, the crystals inside of baby's side can switch between two different frequencies, so it can differentiate baby's sound frequency from other electronic devices at home.
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