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.