The Volume Booster app lets you amplify the sound of your Android device. It works with your device's built-in speaker and microphone, so you can listen to and record your voice and the sound around you.

It allows you to adjust the sound to a level you like, and you can even set the maximum level to boost the sound even more.

It comes with a neat and easy-to-use user interface that lets you control the volume in a simple and intuitive way. You can also choose from three different themes to change the look of the app.

You can use the app as a regular speaker, microphone, and recording device, but you can also use it to play music and record music.