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3.5■Description This app is using so-called mosquito tones are what you can check the age of your ear. ■How to use 'Play' button to ring, 'Stop' button to silence. 'Play' pressing the button, please press the button labeled frequency. The age of your ear to the age of the most significant frequency of the sound heard. In manual mode, you are free to raise from 0 to 30kHz sound operation of the slide bar. With it, you can check over the audible frequency.
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