Feature: 1. Schumann wave 7.83HZ extremely low frequency generator possess high accuracy and stability 2. Adopt high stability frequency acquisition components, high stability pulse chip, accurate correction capacitor, accurate multi‑loop adjustable resistance, shielded solid capacitor 3. Using newly optimized circuit design, stylish silver threaded transmitter circuit 4. Allow people relax physically and mentally, improve the human body's perception of sounds and images, improving human health, enhance the work efficiency, and have a good effect on mental stress 5. Made of ABS material, impact resistance, environmental protection, heat resistance and low temperature resistance Specification: Item Type: 7.83HZ Wave Generator Material: ABS Model: Schumann-FM783 Purpose: Not to directly operate on audio or video products to improve the sound quality, but to relax people's body and mind under the action of the space environment, improve the human body’s perception of sound and images, improving human health, enhance the efficiency, and also have good effect on mental stress Lithium battery 2000mah Schumann Resonances Applied to High Fidelity: 1. The player has a certain high-fidelity experience, and the level of high-fidelity equipment should not be too low. 2. It can be heard that differences between the same system will cause pitch changes on different cables. 3. It is recommended to buy two trial versions (better results). 4. When placing the product on the speaker, in addition to the appropriate weight, vibration-proof treatment is also required. Schumann Resonances Applied to Sleep: 1. It is recommended to buy the test kit at the head of the bed more than 1 meter away from the human body. 2. Test, plus appropriate weight for anti-vibration treatment. 3. Use paper cloth indicator light appropriately and use night light to remove the product. 4. Try for a week, and then review the 7-day experience. . Package List: 1 x 7.83HZ Wave Generator1 x Connection Line Note: 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.