As a rule, you need to place the radio transmitter within 10 feet of the crib so that it can pick up even the slightest sounds made by your baby such as breathing and movement. You can then carry the portable receiver around during the day or just leave it plugged in at the side of your bed at nighttime. The video monitor on the other hand works like a tiny TV by having a camera record the baby s movements while the parent could watch on a small screen receiver. And the sensory monitor is a movement detector that alarms the parent when it cannot perceive any movement from the child for more than 20 seconds. This will serve as a backup in case the apnea monitor fails to detect apnea because it will also manifest in the heart rate of the baby. Another must have feature is a remote alarm. Even if you are not in the same room with the baby, a remote monitor will notify you if anything goes wrong. It must also have a power loss alarm. The truth of the matter is that the price tag doesn t necessarily guarantee that you'll actually get what you need. Like any other products, baby monitors need to suit your lifestyle and satisfy your requirements, even to the slightest of details. So before you purchase one, try to dwell on a number of factors first. Parents, especially busy parents, install these devices so that they may be able to observe and tend to the needs of their baby if they are located in a different place at home. But another very useful function of baby monitors is during sleeping hours. This best applies to a setup wherein the baby stays in a room separate from the parents. Studies have been made over the years claiming that too much exposure to electro-SMOG can result to health problems affecting the nervous system of the body. A person may have such initial symptoms of headaches, disruptive sleep patterns, chronic fatigue and abnormal behavioral patterns in children. How Are Baby Monitors Different from Other Gadgets with Electro-smog?