Item Type: Ultra Low Frequency Pulse Generator_x005F_x000D_Material: PCB+Acrylic Board_x005F_x000D_Purpose: Used for relaxing sleep and improving the body perception of sound and images_x005F_x000D_Frequency: 7.83HZ_x005F_x000D_Rated Voltage: DC 12V_x005F_x000D_Rated Current: 0.5A_x005F_x000D_Power: 0.3mW_x005F_x000D_Working Mode: 7.83HZ Extremely Low Frequency Electromagnetic Wave, Without Any Sound_x005F_x000D_Battery Type: Lithium Battery (Shipped with built in battery)_x005F_x000D_Battery Model: 2000mAh Lithium Battery_x005F_x000D_Nominal Battery Capacity: 2000mAh 1Accuracy Correction Capacitor: Made of high stability pulse chip, accuracy correction capacitor, and accuracy multi loop adjustable resistance. 2Large Capacity Lithium Battery: Rechargeable large capacity lithium battery is used, which can be used for about 400 days after a full charge. 3Improve Human Health: Beneficial to people physical and mental relaxation, improves the human body's ability to perceive sounds and images, and enhances human health. 4Good Stability: Can improve work efficiency, reduce mental stress, ultra low frequency, high accuracy, and good stability. 5Working Status Indicator Light: With working status indicator light (red, green or frequency flashing blue light), you can clearly see the working status.