And you are doctor visiting and getting his advices about a hear apparatus, and a few are not doing this, and they are risks for worsening a health.

As brain attaching to the sound quality, which ear gives to him, and when patient uses apparatus thus he is again uses apparatus as again to absorb sounds, as a more longer he could not heard, thus a harder to do this. As hearing systems are needing for returning hear  and an ability to communication. As to answer on the question a how to select apparatus you must just with a doctor as by a tonal border audiometers as dr surdologist will define a character and level for deafness. As results typing in blank, which calling audiogramma, where having a silence sound for a hearing are sounds as border for hearing and high volume as discomfort border as by audiogramma doctor defines a border for deafness and needing help of such apparatus. As on apparatus selection causes are physiological and individual peculiarities of patient, as a level for deafness, anatomy for ear lobe, and hear canal, a style of life, and activity, as an easy in use, your budget, sound quality, design and his hide, as he is not must to be a very harder, than a needing patient s hear, as and less power his is not gives a right rising. As a good understand a speech in any situations as a natural of sound feels, easy and comfortable use are importance para metres, on which are needing attending, as any type of driver is created with a pathology calculation of hear s pathology, that differences his from a sound rising. As apparatus different by a technological signs as analogical and number, and by a carry method as ear behind and in ear.
As ear behind are very spreading as very easy fixing behind an ear lobe, and models and forms are different, and with receiver are connecting appearances with an ear behind and into canal apparatus.

As into ear model of apparatus or his kind as into canal of a small sizes are hard to remove and enter in ear, as with a destroyed hands motoric or co ordinations are these moves will be very hard, as a date for battery as depending from the model are three till ten days as for two times less ,than in ear behind.
And care here is right needing and control, as for apparatus and ear passage, as into ear apparatus are limiting by a power, theirs using in a light deafness or middle. And in every types of apparatus are having an own peculiarities and contraindications to the using. As into canal, into ear apparatus and with receiver in ear avoiding in the chronic middle otitis and perforation of an ear drum s , and of ear lobe structure is not allows to use these apparatus.