A baby monitor (or baby alarm) is a radio system that is used to remotely listen to sounds made by an infant. An audio monitor consists of a transmitter unit and a microphone, placed near to the child. It transmits the sounds by radio waves to a receiver with a speaker near to the person caring for the infant. There are different types of baby monitors out there – analog and digital sound monitors, video monitors, and movement monitors – each with a variety of options. While analog baby monitors are the least expensive ones digital monitors have the same options, and give clearer sound, wider reception range, and less interference from radios and other electronics than analog models. Baby video monitors combine sound monitors with video. They use a video camera to show pictures from the infant on the receiver (built-in screen or television). Models are available with LCD displays, automatic camera scanning, multiple cameras, and infrared night vision technology. Here you can find some of the most recommendable models.