1. Item type: Ultra-low frequency pulse generator 2. Materials: PCB board + acrylic board 3. Use: It is used for relaxation and sleep and can enhance the human body's perception of sounds and images. 4. Frequency: 7.83 Hz 5. Rated voltage: DC 12V 6. Rated current: 0.5 A 7. Power: 0.3 mW 8. Working mode: 7.83 Hz extremely low frequency electromagnetic wave, no sound 9. Battery type: Lithium battery (with built-in battery) 10. Battery model: 2000 mAh lithium battery 11. Nominal battery capacity: 2000 mAh 12. Precision correction capacitor: It is made of high-stability pulse chips, precision correction capacitors and precision multi-loop adjustable resistors. 13. Large-capacity lithium battery: It uses a rechargeable large-capacity lithium battery and can be used for about 400 days after being fully charged. 14. Improving human health: It may help people relax physically and mentally, enhance the human body's perception ability of sounds and images, and promote human health. 15. Good stability: It can improve work efficiency, relieve mental stress, and has ultra-low frequency, high precision and good stability. 16. Working status indicator light: It is equipped with a working status indicator light (red, green or blue light flashing at the frequency), which allows you to clearly check the working status.