Decibel app is a program that defines a microphone noise. You should hold your phone upside-down to perform right action. The data is displayed in both digital and analog forms.
For your information: 22 dB - complete silence; 50 dB - noise in an office environment;
120 dB - threshold of pain; 150 dB - munitions explosion.
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Supported operating systems:
Nokia MeeGo 1.2, S60 5th Edition, Symbian^3