Item Type:Schumann Wave Generator Schumann wave is applied to HIFI: 1, the player has a certain HIFI experience, HIFI equipment level can not be too low; 2. Can hear and distinguish the timbre changes brought by different wires on the same system; 3. It is recommended to purchase two sets for trial use (the effect is better); 4. Put the product on the speaker during trial use, add appropriate weight for anti-vibration treatment; Schumann wave is used to help sleep: 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; 2. When trial, add appropriate weights for anti-vibration treatment; 3. Appropriate use of paper cloth to block the indicator light to remove night light from the product; 4, try a week, analyze the feeling of use for 7 days; Voltage:DC12V Plug:US Plug 110~240V