These solutions are often in the form of gadgets that have the potential of making life a lot easier for the middle-class, working parents. Then again, if you live in an apartment building with a dozen or more tenants, you could come across a number of additional setbacks every time you try to use a wireless device. Even though it is normal, it may also be a symptom of something more serious that is health related. Basically there are three types of apnea: obstructive, central and mixed. Obstructive apnea is most common in babies and children. It is caused by obstructions in the airway such as adenoids and enlarged tonsils. Some top of the trade devices have sensors placed under the baby s mattress that detects even the most subtle of movements including the baby s breathing. When no movement is detected for a span of 20 seconds or if breathing is below the medically accepted rate, an alarm is triggered thereby notifying mommy. 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. Then again, this added capability comes with a number of drawbacks. The majority of baby monitors designed for people who have hearing impairments are equipped with a vibrating alarm and/or a flashing light system. These added features alert the deaf parent every time the baby is in need of attention. A number of products on the market also offer other means of alerting deaf parents to the cries of their infants. Today, different baby monitors have been developed which make use not only of sounds but of images as well. A great example of this is the video baby monitor. Video baby monitors make use of cameras instead of just the usual transmitter with microphone device. A camera or a number of cameras are installed in the baby s room and live video feed are transmitted to a TV or LCD receiver.