Volume Booster Pro is a free Android app developed by Wait What that falls under the category of Multimedia and subcategory of Music & Radio. The app is designed to increase the volume of your device's audio output by adjusting the frequencies to achieve a louder effect.

The app features a loudness module that runs on devices with Android 4.4 or higher versions. All you need to do is tap the Boost button to enhance the audio output. The app also includes a demo song that helps you spot the difference in the audio output and adjust the desired level of the effect. For older versions of Android, the app provides a slider to adjust the volume.

To get the maximum results, the app recommends using external speakers or headsets. The app also provides a ringtone that can be used to test the audio output. However, it is important to note that listening to music too loud can be harmful to your ears.

Overall, Volume Booster Pro is a useful app for those who want to enhance the volume of their device's audio output. It is easy to use and provides a quick solution to increase the volume.