There are several different styles of hearing aids designed for a wide range of patients. Each one has different gain levels and offer different functionality.
Most hearing aids contain the same basic parts. They hold a small microphone which will help pick up the sounds in your environment. They also contain an amplifier or processor which helps enhance the sound that is received. Finally, the hearing aid contains a small speaker which delivers the sound down the ear canal. Each of these components is housed differently depending on the the style of the device chosen.
Whether it is a device that fits behind your ear or deep inside your ear canal, your audiologist will discuss the pros and cons to each style and find the best solution to meet your specific needs.