A number of products on the market also offer other means of alerting deaf parents to the cries of their infants. One particular product consists of receivers that come in two parts: a main clock and a tiny sound sensor. The main clock functions as the sound-alarm system and is equipped with a vibrating rod attachment that should be positioned under the parents' mattress. Interference with cordless phones and wireless routers is also a common problem. Every now and then, your baby monitor may compete with these wireless devices for better signal reception. For that reason, it is better to purchase one that features a channel adjustment capability. This way, you can change frequency bands every time you encounter interference problems. It has been the topic of discussions that baby monitors, especially audio types, pick up more than just sounds coming from the baby. Some parents tell stories of their baby monitors picking up EVPs. What are EVPs EVP is short for the term Electronic Voice Phenomenon. EVPs pertain to sounds or voices that are allegedly coming from beyond the grave. 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. So to avoid interference, change the frequency of your baby monitor every once in a while and make sure that the frequency you use does not clash with frequencies of other devices. To change frequencies, wireless baby monitors are equipped with a switch that lets parents change frequency easily. 2) Another way to help in solving wireless interference is to find a proper location for the transmitter as well as for the receiver (baby unit and the parents unit). And mothers are truly blessed to have baby monitors in their aid that would ease their burden. What are Baby Monitors Baby monitors are technological device that serve as a pseudo mother who is in vigil at bedside. It is a radio transmitter that release FM (Frequency Modulated) signal most commonly between the ranges of 48,830 to 48,890 MHz.