A free program for Android, by Emax usa llc.
Speaker Booster & Sound Amplifier is a simple, free app to increase the volume of your Android phone's speaker and audio.
It works with any audio source, such as music players, video games, movies, and more. It's perfect for use with headphones, wired or wireless.
With this app, you can amplify the sound from your phone, tablet, or other devices. It can also increase the volume of your Android phone's speaker and audio, as well as your Android phone's system default volume.
It's easy to use. Just tap the Boost button to increase the volume. It works in the background, so you can use other programs while your volume is increasing.
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