Volume Up will be the best volume booster app.

Volume Up is a free app helps your phone sound enhancered, boost your speaker or headphone sound volume, like an amplificatore.

With Volume Up, you can adjust your volume is greater than the default maximum that your phone can play. That makes the listening music, audio, books, movies,... more enjoyable.

You should note that the volume should increase moderately, slowly, to avoid the risks to your phone.

By installing this app, you agree that you will not require the developer to be responsible for any damage to your hardware or hearing. This is software testing.
Not all devices support this software. Try it yourself and see if it works on your device.

Hope you like this app and 5-stars vote then for Volume Up - the app booster volume phone, speaker, headphone for your entertainment more enjoyable, thank you!

Contact
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Free Version
https://play.google.com/store/apps/details?id=com.blogspot.hu2di.volume