Sound Amplifier - Hearing Aid is an iPhone app developed by 汇杭 钟. As the name suggests, this app allows you to amplify the sound around you using your phone and headphones. Whether you need a hearing aid or simply want to boost the volume of your surroundings, this app provides a user-friendly interface for easy operation.

With a 5x Volume Boost feature, Sound Amplifier - Hearing Aid ensures clear and loud sound amplification. You can easily connect your headphones and place your phone near the person or speaker you want to amplify. With just a tap of the play button, you can start amplifying sound.

One of the notable features of this app is its ability to amplify sound in the background without interruption. This means you can continue using other apps or performing tasks on your phone while still benefiting from the amplified sound.

Please note that while the app is free to download, access to premium features requires a subscription. The subscription will automatically renew at the end of each term, and your credit card will be charged through your iTunes account. To cancel the automatic renewal, you can do so through your iTunes account settings.

Overall, Sound Amplifier - Hearing Aid offers a convenient solution for amplifying sound and improving your listening experience. Whether you need it as a hearing aid or for general volume boost, this app provides a user-friendly interface and reliable functionality.