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I've worked with my Dad who has had about 20 sets over as many years and since I share his genes I figure this is early learning for me.
There are 3 technologies used for these. First is to amplify everything which is cheap but this does a better job of amplifying background noise which doesn't help if your hearing loss is only on certain frequencies. The second is to isolate and remove background noise frequencies while increasing voice and the third is to pattern what frequency ranges your ear has trouble with and increase only those to provide normal hearing.
For the past several years the real technology and advancement (and cost) has been combining these into one aid that combines all of these. It's pretty standard now for an audiologist to perform a listening test and map your frequency loss for each ear into the CPU of the hearing aid so it can only amplify those areas. Real "6 million dollar man" stuff and almost as expensive. Depending on your hearing loss condition and severity this is the only thing that works for him. For you maybe general amplification is good enough and thats pretty cheap.
Oh and the bluetooth stuff (TV, cell, phone) sounded great but never seemed to work for him reliably even with the expensive aids. Not sure why but test it out before you buy based on bluetooth. Good luck. . .or should I say GOOD LUCK. sorry bad joke
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