A. Item type: Ultra-low frequency pulse generator B. Materials: PCB board + acrylic board C. Use: For relaxation and sleep, enhancing the human body's perception of sounds and images D. Frequency: 7.83 Hz E. Rated voltage: DC 12V F. Rated current: 0.5 A G. Power: 0.3 mW H. Working mode: 7.83 Hz extremely low frequency electromagnetic wave, no sound I. Battery type: Lithium battery (with built - in battery) J. Battery model: 2000 mAh lithium battery K. Nominal battery capacity: 2000 mAh L. Precision correction capacitor: Made of high - stability pulse chips, precision correction capacitors and precision multi - loop adjustable resistors. M. Large - capacity lithium battery: Using a rechargeable large - capacity lithium battery, it can be used for about 400 days after being fully charged. N. Improving human health: It helps people relax physically and mentally, enhances the human body's perception ability of sounds and images, and promotes human health. O. Good stability: It can improve work efficiency, relieve mental stress, and has ultra - low frequency, high precision and good stability. P. Working status indicator light: 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.