Analogue hearing aids are designed with a particular frequency response based on your hearing test.
Analogue hearing aids essentially amplify all sounds (speech and noise) in the same way. This technology is the least expensive and it can be appropriate for many different types of hearing loss, however the most informed technical bodies today recommend digital hearing aids.
Many previous users of analogue hearing aids have converted to a digital aid and found great improvement in understanding speech in difficult situations where there is a lot of noise.