A vibrating alert is a feature of communications devices to notify the user of an incoming connection. It is particularly common on mobile phones and pagers and usually supplements the ring tone.
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, one of the exceptions being the Nokia 9500: due to the large size of this phone a larger motor would be required to make the phone vibrate. The phone itself would absorb too much of the vibration and therefore the motor required to make it vibrate was too big and could damage the phone.
Vibrating alert motorThe vibrating alert is produced by a small electric motor connected to an eccentric (unbalanced) weight.
Influence of modern culture
The song Vibrate, on the 2003 Want One album by Rufus Wainwright, is centred around vibrating alerts, including the repeated line "My phone's on vibrate for you".
See also
Categories: Mobile phones | Mechanical vibrations
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