Item Type:Schumann Wave Generator_x000D_ Schumann wave is applied to HIFI:_x000D_ 1, the player has a certain HIFI experience, HIFI equipment level can not be too low;_x000D_ 2. Can hear and distinguish the timbre changes brought by different wires on the same system; _x000D_ 3. It is recommended to purchase two sets for trial use (the effect is better);_x000D_ 4. Put the product on the speaker during trial use, add appropriate weight for anti-vibration treatment;_x000D_ Schumann wave is used to help sleep:_x000D_ 1. It is recommended to purchase a set for trial use and put it on the side of a set of beds, which is more than 1 meter away from the human body;_x000D_ 2. When trial, add appropriate weights for anti-vibration treatment;_x000D_ 3. Appropriate use of paper cloth to block the indicator light to remove night light from the product;_x000D_ 4, try a week, analyze the feeling of use for 7 days;_x000D_ Voltage:DC12V_x000D_ Plug:US Plug 110~240V