Aria Connect APP allows you to use your smartphone or tablet to connect to Soundtastic Aria Connect hearing aids or hearing amplifier. Our easy to use hearing devices amplify sounds to make hearing simple and discreet. By amplifying the environment around you, you can hear better in a variety of different settings. Use Aria Connect APP to : Control volume in one or both ears Switch between four listening modes P1: Speech mode P2: Restaurant Noise P3: Road Noise P4: Outdoor Noise Control bass and treble for each ear . Check battery status