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Vibrating alerts are primarily used when a user cannot hear the ring tone (a noisy environment or through hearing loss) or wants a more discreet notification. However, when the device is placed on a hard surface, it can often be as loud or louder than a ringtone. Most 21st-century mobile phones are fitted with a vibrating alert.
The vibrating alert is produced by a small electric motor connected to an off-center weight.
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