Descriptions: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.Features:This product is Schumann wave 7.83HZ very low frequency generator, features high accuracy and stability.High stable frequency acquisition elements: high stability pulse chip accuracycorrection capacitance, accuracy multi-loop adjustable resistor, display solid capacitance. New optimized circuit design, gold-plated launch circuit. Schumann wave can be applied to HIFI or sleep.For audio-visual space - to enhance the sound field and audio-visual effects,For the bedroom - to help sleep soothe the nerves, adjust insomnia, For office - to relax and improve work efficiency, Used to create space - to improve creative inspiration,For the tea ceremony - resting body and mind Specifications:Voltage: DC12VCurrent: 0.5ASize: Approx.10*8.5*1.7cm/3.94*3.35*0.67in Schumann wave applied to HIFI: 1. The player has a certain HIFI experience, HIFI equipment level can not be too low. 2. Can hear, the difference between the same system on the different wire to bring the tone changes. 3. It is recommended to buy two sets of trial (the effect is better). 4. when the product will be placed on the speaker, plus the appropriate weight for anti-vibration treatment. Schumann wave applied to sleep:1. It is recommended to buy a set of trial, on a bedside, more than 1 meter away from the human body distance. 2. The trial, plus the appropriate weight for anti-vibration treatment. 3. Use paper cloth to block the indicator light and remove the night light of the product4.Try it for a week and analyze seven days of experience.Package Included:1 x Ultra-low Frequency Pulse Generator Note:1. Package included a Generator only, power supply are not included.2.This item is finished product, not need to assemble.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.