1. 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 2. Product Features - 1. It has a precisely calibrated capacitor. It adopts a high - stability pulse chip, precisely calibrated capacitor, and precisely adjustable multi - loop resistor. - 2. It uses a rechargeable large - capacity lithium battery, which can be used for around 400 days after being fully charged. - 3. It is 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. It has good stability. It can improve work efficiency, relieve mental stress, and has ultra - low frequency, high precision, and good stability. - 5. It is equipped with a working status indicator light (red, green, or blue light flashing at a certain frequency) to check the working status clearly.