Petralex allows you to create a hearing 'profile'. Using this it then automatically adjusts sounds to your preferences. There is a noticeable time delay between the sound being picked up and processed; this can create an echo between the live speech and the processed speech you'll hear. The delay varies slightly depending on the device you have; Apple devices have the shortest delay.
This app is not designed to be used in place of a hearing aid. If you are using the app a lot, we suggest that you get your hearing tested.
Learn more and get Petralex at the App Store (iOS)
Learn more and get Petralex at Google Play (Android)