They work through the radio frequency and use FM signals to transmit the sound. The major set-back of this variety is the tendency of other receivers picking up the same signal that your monitor transmits, thus less privacy and disturbances are possible. On the other hand, the digital model may cost a little more but it provides more privacy and usually has a wider range of reception than analog. What is Electro-SMOG and How Does It Threaten Our Health? Electro-SMOG is the electromagnetic energy that is emitted by common gadgets in our home such as our televisions, cordless phones, microwaves and digital baby monitors. 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. The camera sends feeds to its partner video monitor used by the parents. Wired or Wireless Baby video monitors can either be wired or wireless. There is really not much difference between the two in terms of monitoring quality except for the fact that wired devices use wires while the wireless ones don t. And children, upon recognizing the familiar voice of their parents are given the assurance that they are watched and are in a safe place, which can be soothing to them. The main priority of most parents who have baby monitors is basically the safety of their children. But if one can provide safety and connect with his or her child without having to compromise work through a simple gadget, then life would certainly be much easier. It is a radio transmitter that release FM (Frequency Modulated) signal most commonly between the ranges of 48,830 to 48,890 MHz. These devices have two components, the transmitter and the receiver. Transmitters are being placed 8-10 feet within the baby or closer if possible. Sounds coming from the baby are being picked up and a signal is then transmitted to the receiver. Nowadays, it is really difficult for any parent to be able to be by their child s side 24/7. But despite such circumstances, it is good to know that technology has managed to make life easier by giving busy moms and dads the option keep an eye on their precious little one even when they aren t in the same room.