In the home and outside, the nursery monitor s baby unit transmits a signal through the airwaves to the parent unit. The range of transmitted signal is usually 300 feet. This keeps the frequencies from baby and parent units within the household property.
Parents select from one of two preset channels to listen to their baby.
The channels permit the nursery monitors to not interfere with another monitor, especially if homes are close. Another potential problem is interference from household products. Certain products such as portable phones, broadcast to the base unit of the phone to the same frequency as the monitor. This results in signals being picked up by the nursery monitor. In addition, many external conditions can affect the range on the monitor, including electrical equipment, power lines, concrete, steel studs in walls, burglar alarms, televisions and computers.