i wear hearing aid since 1987, i saw best hearing aids work for me MIRACAL brand it's analogic. which work 16 years in good condition for my hearing loss. than after audiologist suggest make new aids hearing loss is more now server to profound. i was buy siemens'- nitro in 2011. after 22 visit hearing aids office technician adjust hearing, but after 3 years hearing change, go same office, old technologist sold their office to other audiologist. new audiologist make too much loud in my aids, than 2nd day visit again, but un fortunately audiologist run away from office, as per their secretary, after 7 days new audiologist appointed, visit them, he ask me make new aids this is not good.than i was contact SIEMENS direct. they suggest 3 different audiologist for adjust program. i visited 2 audiologist diferent time interval, charge $120.00 EA.VISIT still to day never adjust program, after complain they told buy new aids, we know they make more money for new. now looking aids on online. if you have some profond hearing aid information. pl. provide. also you can save money for battery BUY online 'AMAZONE' sell $13-15. 60 battery it's less than 0.25c. cost work same period like revoyac or duracell.