1-Do not listen to it if あなた are under 18. 2-Make sure there is no ハート, 心 disease. 3-Don't listen to it if あなた are easy to get shocked. 4-You don't have high Blood Pressure Disease.(Hypertension) 5-You don't have Sugar disease.(Diabetes) 6-Don't eat または drink during listening to it. 7-Make sure all the windows and doors are opened in the case of having suffocation.