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  2. Alarm device - Wikipedia

    en.wikipedia.org/wiki/Alarm

    an alarm clock that sounds an alarm at a pre-set time, often used to wake a person up or remind them of an event. a fire alarm which is used to give occupants of a building early warning of a potential fire and give them time to evacuate. warning devices on a vehicle that sound when it is moving in an unexpected direction, such as reversing,

  3. Dawn simulation - Wikipedia

    en.wikipedia.org/wiki/Dawn_simulation

    A dawn simulation alarm clock. Dawn simulation is a technique that involves timing a light, often called a wake-up light, sunrise alarm clock, or natural light alarm clock, in the bedroom to come on gradually, over a period of 30 minutes to 2 hours, before awakening to simulate dawn.

  4. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...

  5. Fire alarm call box - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_call_box

    When the box is activated by turning a knob or pulling a hook, a spring-loaded wheel turns, tapping out a pulsed electrical signal corresponding to the box's number. [1] A receiver at fire headquarters announces the alarm through flashing lights or tones, or via a pen recorder, and the box number is matched to a list of box locations.

  6. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    A fire alarm notification appliance is an active fire protection component of a fire alarm system. A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action. Audible appliances have been in use longer than any other method of notification.

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  8. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    Most commonly, these are bells, sirens, also and or flashing lights. Alerting devices serve the dual purpose of warning occupants of intrusion and potentially scaring off burglars. Keypads: Keypads are devices that function as the human-machine interface to the system. In addition to buttons, keypads typically feature indicator lights, a small ...

  9. The mystery of the flashing lights at the White House has ...

    www.aol.com/2017-05-31-the-mystery-of-the...

    The flashing red lights were spotted in President Trump's second floor residence on Sunday night, causing concern and sparking chatter on social media. The mystery of the flashing lights at the ...

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