Alarm
type of device that alerts people to a dangerous condition by means of visual, audible or sensitive signals, using sensors or measurements already observed and sometimes imposed and controled
An alarm is something used to alert people quickly to something. Most alarms use loud noises and/or flashing lights. Some alarms may use other ways of attracting peoples attention quickly, such as turning off loud machinery, shaking a bed or pillow.
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Types of alarms
change- Alarm clock - A clock designed to make noise to wake up people.
- Burglar alarm - An alarm that sounds if a person tries to enter a building without permission.
- Siren on an emergency vehicle (ambulance, fire truck, police car).
- Severe weather sirens - Used to warn of severe weather, such as tornadoes or tsunamis.
- Klaxon - A type of siren, known for it's distinct sound. Often found on submarines.
- Fire alarm - An alarm for warning of fire inside of a building.
