How about scio biofeedback instrument?

Brain biofeedback therapeutic instrument is the best choice. There are two kinds of human nervous system: one is the voluntary or somatic nervous system, which controls the movement of skeletal muscle; The other is the involuntary or autonomic nervous system, which regulates the activities of internal organs such as heart, blood vessels, stomach and endocrine glands. For visceral organs that are traditionally thought to be uncontrollable at will, people may be aware of the functional state of these visceral organs and the changes in the correction process because biofeedback instruments can amplify the signals of these organs' activities and convert them into visual and auditory signals that can be perceived by eyes and ears.