Volume Booster - free app to booster your volume, speaker, music or headphone sound volume, like an amplificatore. ✍️ Note: * We have 3 modes for you to quick settings: MUTE, NORMAL and BOOST. * Music boost, playing audio at high volume may damage speakers/hearing. * You should choose to increase the volume booster below 40%. You will have sound safe. * This app does not work on most 4.2.1 - 4.3 devices. It should work on 4.4 and higher. * This is not for adjusting the speakerphone volume in phone calls. * The volume should increase moderately, slowly, to avoid the risks to your phone.