The Schumann wave itself does not emit any sound, nor is it connected to other devices. It can be used only by plugging in. It does not directly act on audio or video products to improve the sound quality and picture quality, but acts on the space environment to provide a specific to improve sound quality and picture quality.Frequency, Schumann wave 7.83Hz offsets the frequency of negative interference of electromagnetic waves and radio waves, making the sound space reverberation stable and harmonious, allowing listeners to enjoy music more attentively and pleasantly, relaxing the body and mind, improving the human body's perception of sound and images, improving The health of the human body improves the efficiency of work creation, and also has a good effect on insomnia, mental stress, etc.Product name: Schumann wave very low frequency pulse generatorApplicable voltage: 100V-240V universalRated voltage: DC 12VRated current: 1.0AProduct accessories: standard 12V DC supplyPlug Type: Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on.Colour:As shownMaterial:PCB Package Contents:1 x frequency pulse generator1 x AdapterOnly 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.