These come in various sizes depending on the strength of the hearing aids (more powerful aids require bigger batteries hence the aid is bigger). They fit completely into the ear and there are no extra cords or wire. They can have a volume control if needed or work with a remote control.

These are the more traditional hearing aids that have the part containing the electronics fitted behind the ear. This connects to an ear mould usually made out of plastic that sits in the ear and sends the sound down the ear canal. These aids are available with or without a volume control and some models can also be operated by remote. There are waterproof models available too.

These are the newest types of hearing aids and are mow the most popular. Like behind the ear models they fit behind the ear but are very small (about half to a third) compared to the regular behind the ears aids. A tiny thin plastic tube connects to either a plastic dome or a small ear mould to ensure that the sound goes in the ear. Their main advantage over the other types of hearing aids is they don't block the ear and they have a more natural listening experience.