... 4.5KHZ, 15KHZ, points with the role of different levels, the higher the frequency, the deeper role. Each frequency using the time not more than 30 ... minutes.b.Frequency: 1.5KHZ-4.5KH, 4.5KHZ-15KHZ, 15KHZ-1.5KHZ, the ... feedback system will be such a biological signal stored in the brain stimulation, and negative feedback, so that the body can easily produce ...