A visual alarm signal (flashing light) giving notice that an audible event has taken place like a doorbell ringing, a fire alarm or a ringing telephone. Some systems monitor a single event while others can monitor several events at the same time and indicate which event has occurred. This is a device which is used by people with hearing loss. Since they cannot hear, people rely heavily on any visual aid. Therefore this kind of device is very important for them. It makes their lives easier. According to the Americans With Disabilities Act, every building needs to have visual fire alarms. The reason for this is that a def person cannot hear the fire alarm and therefore they can’t know if there is a fire danger. When they have a visual alar signal, then they know that they need to get out immediately, just like anyone else. The same thing is with baby criers, door knockers, typical alarm clocks etc. A def person needs a door knocker to know visually that someone is at the door. If they have a baby, unless they are looking at it they don’t know if the baby is crying. For instance, if the baby is in the other room, a def mother can’t hear it crying, unless she has a monitor which blinks when a sound is made.