Designed for people who have high frequency hearing loss, open ear technology consists again of a hearing instrument that goes behind the ear and an ultra thin tube, which sends the sound into the users canal. At the end of the tube is a small rubber dome, which is available in different sizes and is interchangeable according to the individuals hearing loss. The advantages of open ear aids are firstly that they can be very small and barely noticeable and secondly they are extremely comfortable to wear.