CIC hearing aids are designed in a way that they fit inside the ear canal. Because only a small portion of them is visible externally, they are very difficult to notice, especially from a distance or when the person is facing the hearing aid wearer. They are good for both, in-person and telephonic conversations as they have low feedback, effectively block out background noise, and have a microphone. While CIC hearing aids are ideally suited to address mild to moderate hearing loss, some models also have the ability to address severe hearing loss.