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A buzzer or beeper is an audio signaling device, [1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices , timers , train and confirmation of user input such as a mouse click or keystroke.
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 ...
A break-in and cutting wires would cause an alarm to sound. The device operated on a 12-volt battery and included extra loud "B" bell, heavy-duty weather-resistant cabinet with built-in tamper resistant circuit, 125' of double stranded wire, six sets of magnetic switches, two keys, panic button, indoor "ON-OFF" control, and warning decals.
Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types of security systems. Homeowners typically have small, self-contained noisemakers.
A typical 240-volt electric wall clock produced by Gents' of Leicester, dating to approx. the late 1960s. A later Model 2500 Chloride Gent Warbler, complete with instruction manual and box. Chloride Gent Warbler, original fire alarm sounder, dating from 1980, at a secondary school in Derbyshire.
Fire alarm bell. Fire alarm bells are divided into two categories: vibrating, and single-stroke. On a vibrating bell, the bell will ring continuously until the power is cut off. When power is supplied to a single-stroke bell, the bell will ring once and then stop. It will not ring again until power is turned off and on again.