It is always important to keep tabs on your child, even when they are sleeping. Since it is not always practical to be in the same room as your child as they sleep, many people use
Originally these monitors were physically wired together, so people commonly wired them into the home. Today, most people use wireless transmitters, which allow them to be used in pretty much any room of the house. The video monitors, which are increasingly popular, have a shorter range than those that only transmit audio. Many of these can be accessed over the internet, so they can be used away from the home.
The wireless monitors, which are by far the most common type used. Since it is wireless, it is possible for the signal to be intercepted, but most monitors take steps to allow this to be avoided, such as allowing transmission over different frequencies. Some also use a system called DECT, which is more secure, but some have concerns about the radiation put out by DECT.
DECT is the same technology that is used in most cordless phones and is designed to make transmissions private between the transmitter and receiver. It stands for Digital Enhanced Cordless Telecommunications and was originally developed by the European Telecommunications Standards Institute, but has since been adapted by the United States and is used throughout the world.
The advantage of these devices is that if the baby begins to cry, the parent can be instantly aware. Some even allow the parent to talk to the child from another room or start music playing in the room.