Features Quiet inside of your car
Invert (opposite phase) the sound taken from microphone and output it to speaker.Its a simple noise canceling app.Since it is made with the minimum program, if you have a smartphone with high processing speed, you might be able to keep quiet inside of your car or your room.※For smartphones with battery saving mode,  Auto-startup and background services may not work correctly. In that case, Please allow it yourself from the individual app settings on the system settings menu.
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Available for Android 8.0 and above