I don't know how effective the Verbal Bicycle Bell is compared to a regular bell or your own lungs, but it claims to generate 80 decibels with its 44mm speaker. It screams "On your left!" and holds a 20-second recording.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/_yWXuIIJKkE/i-hope-the-verbal-bicycle-bell-has-a-curse-button
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