Mobile booster volume PROMobile booster volume PRO is also a dream volume control tool, after you use the "max" mode of the Speaker Booster, you can easily return to the original volume status by clicking the "normal" mode. And when you are on meeting, in the library, going to bed or any other occasion that needs silent, you can just click the "silent" mode.Feature:1. One key to increase all sound stream volume to maximum, no need to independently louder speaker volume, loud alarm clock, loud ringtones, or louder music volume etc.2. One key to turn your phone into silent mode, it is so convenient when you are on a meeting or going to bed.3. One key to normal mode to restore the original custom phone sound.4. The ""System Sound"" in this Speaker Booster include ringtone sound, notification sound, DTMF and other system sounds.5. Realistic graphic and cool user interface.Simply tap on the icon and let the app calibrate your sound settings!This app will increase your overall sound quality and make your Android phone sound like a professional media player.It works for both speakers and headphones. You will also discover a significant difference in your ringer, alarm and voice call level.