Not having this feature could be very dangerous to the child because one might not notice that something wrong has already happened if the monitor stops working when the battery drains. In choosing a monitor, the right range or bandwidth must be considered properly. If it would be used in a bigger house, then a wider range is required. On top of that, you can even play music or transmit almost anything you want to the baby. Some doting parents also make use of this feature to calm their babies down by talking to them over the baby monitor. Also, when your child is old enough to speak, you can surely have chats by means of this nifty device. Even the simpler models of these monitors like the audio monitor at least keeps the parents aware if their baby needs them, especially when the child cries. With this technology, parents are given a way to make sure that their baby is safe especially during times when no one is left inside the room to watch the child. Do you believe in the afterlife? These questions seem to have no specific and factual answers and so does the question Are EVPs real? A sound is just a sound and it all depends on how they are interpreted. If the sound of a cat is interpreted as a moo of the cow, then it comes from a cow. If an inaudible noise is interpreted as voices of people from the afterlife then it comes from people in the afterlife. So to prevent this from happening, you should try to change the frequency of either device. Wireless baby monitors are usually equipped with switches that allow parents to change frequencies easily. The next option in fixing interference is by properly placing the baby monitor, both the baby s and the parent s units, in the proper location. These wireless interferences are usually caused by other wireless devices around the house like the wireless phone or a router. Other wireless baby monitors from your neighbor s house can also cause interference. Fortunately, there are ways to solve these kinds of problems like adjusting channels or changing frequencies.