Put on some headphones tap the center button and you can hear and amplify what your phone's microphone is picking up. Use headphones to avoid audio feedback.

It's also possible to record audio and set up an automatic noise-trigger to get notified via email that a specified noise level threshold was exceeded.

Whether you want to responsibly audio-monitor your environment or just amplify sounds for fun Ear Scout streams the audio from the mic to your headphones in real time. To fine-tune the incoming signal use the audio equalizer.

DISCLAIMER. This app is for non-harmful sound amplification (e.g. listening to nature / property monitoring) not to listen in on private conversations via Bluetooth. Use Ear Scout responsibly.