Extra Volume Booster Equalizer, an easy-to-use volume booster and equalizer + speaker booster + bass booster free with cool edge lighting , give yourself an immersive opportunity to listen to music of loud volume and high quality on your phone and tablet!   Features: 🎺Speaker booster for Android devices 🎺 Music equalizer with different sound level and frequency, treble & bass 🎺 Sound booster for headphones & external speaker & bluetooth 🎺 Stereo surround sound effects 🎺 3D Virtualizer ef