Consolidate your memory while you sleep Suitable for stabilizing the mind while meditating Stimulates the brain into deep sleep Suitable for improving inspiration when thinking Product size is compact and easy to carry Product Description Earth's brain wave Schumann wave itself does not emit any sound, not connected to other equipment can be used only plugged in, not directly on the audio or video products to improve the quality of sound and picture quality, but the role of the space environment, to provide a specific frequency of electromagnetic waves, this electromagnetic frequency first discovered by the scientists Schumann, the frequency of this electromagnetic wave and the size of the Earth, all kinds of creatures have long lived in the electromagnetic waves, of Artemisia and the birth of a . Electromagnetic waves, can improve the human body to the sound and image perception, improve human health to improve the efficiency of work, insomnia, mental tension, etc. also have a certain effect. It is normal for each person to experience different results Color: Black 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.