Hearing aids worn in the ear are usually custom-fit, based on a cast or impression of the ear. They’re available in different skin tones to camouflage with the outer ear. There are several styles – each is listed below, ranging from smallest to largest.
Invisible In-The-Canal (IIC)
The smallest custom style, IIC instruments site invisibly in or past the second bend of the ear canal. IIC are specifically designed for mild to moderate hearing loss.
The smallest custom style, CIC instruments fit deeply and entirely within the ear canal. They fit mild to moderate hearing losses and offer high cosmetic appeal as they’re nearly invisible when worn.
ITC instruments sit in the lower portion of the outer ear bowl, making them comfortable and easy to use. Because they’re slightly larger than CIC models, they have a longer battery life, and can host additional features such as directional microphones for better understanding in noisy environments, and controls such as volume controls. They fit mild and moderate hearing losses.
Half Shell (HS)
Half shell models fill half the bowl of the outer ear. Like ITC models, their size enables the addition of features such as directional microphones, volume controls and push buttons to activate special settings for different listening environments. Because of their size, they may be easier than smaller models to handle for some people and yet are still often disguised by hairstyles or sideburns. This hearing aid style looks similar to the ITC hearing aid when worn on the ear, but is slightly larger.
Full Shell or In-the-Ear (ITE)
Full shell models sit flush within the outer ear bowl. Their size allows the maximum number of additional controls and features such as directional microphones, which require space on the outer portion of the instrument. They use a larger battery size than the smaller styles, and can fit a larger receiver with enough power for even some severe hearing losses. Because of their flexibility, they’re widely recommended for mild to severe hearing loss.