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An alarm clock is a timekeeping device designed to alert an individual at a specified time, typically to wake them up from sleep or remind them of a task. Most alarm clocks have a built-in buzzer, bell, or electronic sound that can be set to go off at a specific time. Modern versions may include additional features such as radio alarms, digital displays, snooze buttons, and even smart connectivity for syncing with phones or other devices. Alarm clocks can be analog (with hands on a dial) or digital . Some also include options like adjustable volume, vibration, or gradual light to wake the user gently.