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Shop the best loud alarm clocks for heavy sleepers on Amazon and more that are recommended by our editor, who tested several of them, and a sleep psychologist.
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 ...
Early alarm devices were often bells, drums, other musical instruments, or any items which made unusual loud noises that attracted the attention of the surrounding population. Whistles were used by police in the 19th century. Steam whistles have been used on locomotives, ships, and in factories as alarm devices.
There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ An 1860s-era siren. [2] A siren is a loud noise-making device. There are two general types: mechanical and electronic.
A personal safety alarm starts sounding once the emergency button is pressed. A personal alarm is a small hand-held electronic device with the functionality to emit a loud siren-like alarming sound. It is activated either by a button, or a cord that, when pulled, sets the siren off.
Alarm Clocks. 725-2008 Prior to the year 725, no one was ever on time for anything. ... at least compared to the technology's peak of popularity in 1997 when 3.6 million of the loud, bulky ...