It is all depends on your severerity of hearing problem. You should consult with an Audiologist and do an audiometry test. As per result go for a hearing aid trial with 3-4 diffrent model of hearing aid. Check your speech understanding, environmental sounds and how pleasant it is. After finalizing the model the audiologist will fit it properly.
Probir Karmakar
Hearing Plus
Hearing aid is manufactured by many companies and comes with variety of specifications. Also they can be behind the ear, in the canal depending on where they are placed. You need to consult a good Audiologist who can guide you towards buying appropriate hearing aid which matches your requirements
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