iHEAR aXis OTC Hearing Aids Set.Advanced Technology. Adjustments can be made with the App or directly on the device, no App necessary.- Receiver in Canal: great for amplifying high frequency sounds like birds & higher pitched voices.- Personalize to your needs with the MyiHEAR app. – Directional microphones. – Customize your sound environment with 4 programs & 11 volume levels. – Rechargeable with portable charging case. – Advanced digital feedback suppression.- Advanced background noise reduction. – Crystal-clear digital sound. – Magnetic snap charge dock.