Yes; Halo Sport 2 is only intended for use by individuals 18 and older.
The electrical stimulation technology behind Halo has been studied across thousands of testing sessions, but to date there has been limited research conducted in younger age groups. Younger brains may respond differently to neurostimulation than adult brains. Younger individuals also have thinner skulls, and their brains are naturally developing at a faster rate.
Some academic labs are beginning to investigate the use of neurostimulation for therapeutic purposes in individuals under 18, but further research is still required.
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