Used in space--Improve inspiration Used in the bedroom--help sleep and tranquilize the mind, cure insomnia Used in - relaxation and improve work efficiency For audio-visual space - to enhance the sound field and audio-visual effect Used in tea ceremony, spiritual practice, meditation space - to calm the body and mind. Schumann wave itself does not emit any sound, not connected to other equipment, only plug-in can be used, not directly in the audio or video products to improve the sound quality of the picture quality, but the role of the space environment, to provide a specific frequency of electromagnetic waves, this electromagnetic frequency first discovered by the American 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, and to flourish and prosper. All kinds of organisms live in this electromagnetic wave for a long time and reproduce for . Schumann .83Hz offset electromagnetic waves radio waves negative interference frequency, so that the sound space reverberation stability and harmony, so that listeners can be more focused and happy to enjoy the music allows people to relax physically and mentally, improve the human body to the sound and image of the perceptibility, improve human health to improve the efficiency of the work of the process, insomnia, mental tension, etc., but 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.