If you need to amplify the sound around you beyond what is normally possible with your phone with no lag, this app is for you. Sound is High Quality! Can also be used with Bluetooth with low lag. Use it if you have a hearing loss. With a cabled headset, it's perfect fo conversations, Television and anything you have trouble hearing. Use it if you have tinnitus to get more/higher environment sounds, this could remove your tinnitus. Options to select input source and output source. Warning: