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. It means that the baby monitors should be placed as far away as possible from other wireless devices. This includes cell phones, cordless phones, and routers. Microwave ovens could also cause interference on your baby monitor. Since it is inevitable that you will be using other wireless devices around your flat, one of the best things you could do to prevent interference is to always prioritize your baby monitor. Another annoying part of the whole interference dilemma is the fact that you could sometimes pick up your neighbor's phone conversations on your baby monitor and vice versa. This makes it even more difficult for you to hear or decode the sounds that are coming from your baby's room. How to fix Wireless Interference? EVPs pertain to sounds or voices that are allegedly coming from beyond the grave. In the world of the ghost hunters, EVPs are voice recordings that are sent by ghosts or souls that have not moved on. These are sometimes used to prove that there really is life after death. While some ghost hunters use sophisticated gadgets and devices to hunt down ghost phenomenon, there are those who use baby monitors. Currently, there are two types of baby monitors: video baby monitors and audio baby monitors. Video baby monitors, as the name implies, use video footages for overseeing events in the room where the baby is located. It incorporates the technology used by webcams in computers. Instead of only using the simple transmitter with microphone, a camera is installed with it. Other Safety Tips - Don't ever use a mere baby monitor to justify your absence. Parental supervision is undoubtedly important, especially if you live in an apartment building where strangers can easily come and go. - Do not position a baby monitor's transmitter or receiver near water. Like any electronic device, baby monitors can cause an electrical shock if not used properly.