When you put your smartphone on the rack and put the lid back, how much noise do you hear?

The device is called the "Smartphone Noise Analyzer".It's supposed to measure the amount of ambient noise around you to determine if you're on the right track or the wrong one.The device's developers say that, when properly calibrated, it can help you avoid distractions and focus on the important task at hand.According to the website, the device's user interface shows how

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