Hearing Aid Master (Crystal) is a useful and simple-to-use hearing aid and sound amplifier app for Android devices. It is ideal for people with mild hearing loss and for those who want to boost their hearing. It is also ideal for people who want to listen to music or watch videos with better audio quality.

How does Hearing Aid Master work?

When you install the app, you will be asked to select the sound you want to boost. After that, you will be able to select the level of amplification you want. The higher the level, the louder the sound will be.

Hearing Aid Master (Crystal) will automatically change the volume level of the sound.

The app also has an option to set the audio filter. You can select the type of filter that you want. There are four options available: None, Low Pass, High Pass, and Audible. You can also choose the sound level of the microphone.