BH Tecnovita SonixPlus YU180 Manuel De L'utilisateur page 28

helping you select the time interval during which the waves reach your
skin.
In addition, you can independently select either of the two handsets, one
with a flat base and the other with a tapered end, depending on the area
where they will be applied. The different sizes and shapes ensure that
they fit perfectly into tricky areas of the face such as around the contours
of the eyes and lips. You must select one or the other, it is not possible to
work with the 2 handsets at the same time.
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