A. Product Information 1. Item type: Ultra-low frequency pulse generator 2. Material: PCB board + acrylic board 3. Use: For relaxation and sleep assistance, and to enhance the human body's perception of sounds and images 4. Frequency: 7.83 Hz 5. Rated voltage: 12 volts DC 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 (shipped with built - in battery) 10. Battery model: 2000 mAh lithium battery 11. Nominal battery capacity: 2000 mAh B. Product Features 1. Precisely calibrated capacitor: It adopts a high - stability pulse chip, precisely calibrated capacitor, and precisely adjustable multi - loop resistor. 2. Large - capacity lithium battery: It uses a rechargeable large - capacity lithium battery, which can be used for around 400 days after being fully charged. 3. Beneficial to human health: It helps people relax physically and mentally, enhances the human body's perception of sounds and images, and promotes human health. 4. Good stability: It can improve work efficiency, relieve mental stress, and has ultra - low frequency, high precision, and good stability. 5. Working status indicator light: It is equipped with a working status indicator light (red, green, or blue light flashing at a certain frequency) to clearly check the working status.