You must wear headphones for this app to work.This app enhances your hearing. Its great for birdwatchers, students in large classrooms where its hard to hear the professor, and anyone else who needs to enhance their hearing (like spies). WARNING: This app makes sounds very loud. Use common sense and caution.To use: Plug in your headphones and simply press the "Activate" button and aim your microphone in the direction you want to listen. When you are ready to stop, press the "Deactivate" button.If the sound isn’t loud enough, adjust the overall volume of your phone.Send any bug reports to [email protected]