Feature:1. Accuracy Correction Capacitor: Made of high stability pulse chip, accuracy correction capacitor, and accuracy multi loop adjustable resistance.2. Large Capacity Lithium Battery: Rechargeable large capacity lithium battery is used, which can be used for about 400 days after a full charge.3. Improve Human Health: Beneficial to people physical and mental relaxation, improves the human body's ability to perceive sounds and images, and enhances human health.4. Good Stability: Can improve work efficiency, reduce mental stress, ultra low frequency, high accuracy, and good stability.5. Working Status Indicator Light: With working status indicator light (red, green or frequency flashing blue light), you can clearly see the working status.Specification:Item Type: Ultra Low Frequency Pulse GeneratorMaterial: PCB+Acrylic BoardPurpose: Used for relaxing sleep and improving the body perception of sound and imagesFrequency: 7.83HZRated Voltage: DC 12VRated Current: 0.5APower: 0.3mWWorking Mode: 7.83HZ Extremely Low Frequency Electromagnetic Wave, Without Any SoundBattery Type: Lithium Battery (Shipped with built in battery)Battery Model: 2000mAh Lithium BatteryNominal Battery Capacity: 2000mAh.Package List:1 x Schumann Wave Generator1 x USB Data CableNote:If the battery is insufficient, please charge in time to avoid bad experience.