@Yellow_Bird: We’re asking you to post dad’s audiogram because, before recommending any device, we need to know whether dad’s hearing loss is mild, moderate, severe, or profound, and detailed numbers about that as well as any other issues revealed in testing. Buying aids without matching them to test results is less likely to help dad.
There are inexpensive (as in a few hundred US dollars) devices available without a prescription that may work reasonably well for milder losses. But I have a feeling you wouldn’t be asking for help here unless dad’s loss was greater than that, in which case, the inexpensive devices may not be a good buy. Buying aids that couldn’t match his loss would be like buying under-powered eyeglasses.
Also… if he’s had severe or profound hearing losses for a decade or more that have not been effectively treated with hearing aids, he may have limits in cognitive ability to process speech. It can be a use-it-or-lose-it situation. Some people are in such denial about hearing loss that by the time they’re finally ready to try aids, even the best aids for them may result in what they perceive as louder gibberish, and they throw the new aids in a drawer and give up. This doesn’t mean it’s not worth trying; it just means that more help as from a cognitive hearing specialist and a commitment for patience and extra effort from dad is needed as well as the right hearing aids.
Where is dad (city/country)? This also narrows the options.
Does he like/use/want aids that he can adjust with a smartphone app, or is he generally reluctant to use high tech devices?
As someone whose parents have passed but had to deal from a distance with their aging including hearing loss, you have my sympathy. It’s a challenge.
p.s. Your English is very good, better than many of us native Yanks and Brits, so no apologies needed there.
