Phonak Una User Manual page 22

Preparation
Closed domes
The closed dome has a different design than the open
dome, refer to picture. The closed dome consists of two
fins overlapping each other. Before inserting the closed
dome into the ear canal it is important to check the
position of these fins. The bigger fin must be
positioned over the smaller fin, see picture . If the
position is incorrect , you can easily adjust it with
one finger, just bend smoothly the bigger fin forwards
and then back again so that it is overlapping the smaller
one, see picture . Make also sure that the slit of the
closed dome is in a horizontal position on the tube
unit, as shown in picture . Your closed dome is
ready to be inserted into the ear, refer to page 20.
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