Having an indicator on the gadget that activates whenever the battery is low prevents instances of the battery running out without you knowing. 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. 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. Baby monitors are good for this kind of activities since they are quite sensitive to sounds as well as other factors in the environment. If you prefer to have one radio transmitter in every room, there are actually a smaller number of choices. In order to set up a multi-room monitoring system, some parents purchase more than one baby monitors. By simply positioning one radio transmitter in each room, you can listen to the sounds coming from your baby's room even if you're busy with house chores or other stuff. This feature allows parents to carry the device around without much effort. If you intend to take the receiver anywhere in the house for extended periods of time, test out the attachment method just to be sure that it's durable enough to endure daily usage. In addition, you also need to check the battery life and power source. Basically, a baby monitor, also known as a baby alarm, is a device that can be used to monitor your children or babies even if they are located in a separate room than yours. It is a simplex transmitter and receiver system that can be used to remotely listen for different noises made by your kids and babies. Conventional Baby Monitors VS Baby Video Monitors The question whether to use the conventional simplex baby monitors or the baby video monitors will all fall down to preference. If you think that using the conventional baby monitors would be enough for you to monitor your child, then so be it. But if you think that having visuals over your child would make you feel that your child is safer, then go for baby video monitors.