Consolidate your memory while you sleep Suitable for stabilizing the mind while meditating Stimulates the brain into deep sleep Product size is compact and easy to carry Suitable for improving inspiration when thinking Description Schumann wave itself is not directly acting on the sound or video products to improve the quality of sound quality, but the role of the space environment, people's physical and mental relaxation, improve the body's perception of sound and images, improve the health of the human body to improve the efficiency of work, mental stress also have a better effect. It is normal for each person to experience different results Color: Silver Material: plastic Package Contents: 1 x mainframe 1 x usb cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.