BH Tecnovita SonixPlus YU180 Manuel De L'utilisateur page 37

VERY IMPORTANT
*** Never exceed the application times (a total of 15 minutes per
session in one day). Exceeding recommended applications can cause
fatigue and skin irritation. On sensitive or allergic skins applications should
be of short duration and at low energy settings.
*** And, above all, respect the rest period of 48 hours between
sessions. This is the time that your skin needs to rest.
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