20 Hz Beta Contemplative
BEta brainwaves are bla bla bla
Recommended use: in bedroom
Over headphones
5 minutes
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20HZ Beta Concentrate
Bydvygiyou listen to this you’ll concetrate alot
400 HZ test
Bydvygisome other description
BEta brainwaves are bla bla bla
Recommended use: in bedroom
Over headphones
5 minutes
you listen to this you’ll concetrate alot
some other description