According to Mashable:
The iPhone app is called Blower and it works by moving air through the speakers of your iPhone (strictly speaking, the same thing happens when you play music through those speakers, but let’s not be too harsh on the novelty part of the application).
Check out the app in action:
Or you can use it to blow away “herbs.”
This actually seems like a lot more work than just, you know, breathing on the candles, or dragging your hand across the table. Whatever, it’s only $0.99.
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Video: YouTube / QneoDotNet