7.83hz for Schumann Wave Extremely Low Frequency Pulse GeneratorComprehensively Optimize The Circuit And Upgrade MaterialsUsed For Space - To Improve Inspiration; Bedroom - To Help Sleep, Calm The Mind And Treat Insomnia; Office - To Relax Body And Mind And Improve Work Efficiency; Audio-Visual Space - To Improve The Sound Field And Audio-Visual Effects; Space For Tea Ceremony, Spiritual Practice And Enlightenment - Relax Your Mind And BodyItself Does Not Emit Any Sound, Nor Is It Connected To Other Devices. It Can Be Used Just By Plugging In. It Does Not Directly Act On Audio Or Video Products To Improve Sound And Picture Quality, But Acts On The Space Environment To Provide An Electromagnetic Wave Of A Specific Frequency. The Frequency Of This Electromagnetic Wave Is Related To The Size Of The Earth. Various Creatures Have Lived In This Electromagnetic Wave For A Long Time And Have Reproduced For .For Schumann .83hz Offsets The Frequency Of Negative Interference From Electromagnetic Waves And Radio Waves, Making The Reverberation In The Sound Space Stable And Harmonious, Allowing The Listener To Enjoy Music More Attentively And Happily, Relaxing The Body And Mind, Improving The Human Body'S Perception Of Sounds And Images, And Improving The Health Of The Human Body Improves Work And Efficiency, And Also Has Certain Effects On Insomnia, Mental Stress, Etc.Product Name:for Schumann Wave Extremely Low Frequency Pulse GeneratorPower Supply Voltage:5V (USB Interface)Rated Current:0.5ASignal Strength:The Buttons On The Right Are Used To Adjust The Strength (0, 1, 2, 3, 4 Sections)Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The UseColour:As ShownMaterial:Plastic+MetalSize:About 100x86x15mm (Length x Width x Height)Package Contents:1 * Signal Generator Module1 * Data Cable1 * ShellOnly 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.