Instead, they receive muffled, indefinable, and sometimes almost inaudible sounds which resemble voices and words coming from a human. When examined by experts, these sounds can t be technically explained. But when examined by professional ghost hunters, they turn out to be ghost voices also known as electronic voice phenomenon. This next issue can be a disadvantage for some people but not for others. This issue is about the price. Digital baby monitors are quite more expensive compared to other baby monitors. This is expected though since it is using the latest of modern technology. If you have the right budget or extra money to spare, then the issue of price is not really that of a disadvantage for you. The audio baby monitor receives and sends sound so that the parent could hear the baby from a distance. 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. They use a small camera either mounted on the wall, table or crib to transmit the images into the LCD display. They are usually portable and come with multiple cameras and even night vision. Sensory monitorsdetect the baby s slightest movements even during sleep. It fits under the mattress of the baby and alarms you when the baby stops moving or is absolutely still for 20 seconds. This new feature has proven to be very beneficial to many of today s parents. These two-way baby monitors not only provide parents with a means to check on their baby, but a means for parent-child bonding as well. What is the difference between the two-way monitor and one-way monitor? One-way monitors from the name itself, basically only transmit sound through a single channel wherein parents can hear the sounds that their baby makes from the other end. Since this is the kind of service and specialty they provide, you can be quite sure that you as parents are given the best possible monitoring they can provide. This is one advantage of going pro. Another advantage is that there is usually customer support that will be willing to help you in case you encounter any problems.