Features: Benefit to people's physical and mental relaxation, improve the body's perception of sound and images, improve the health of the human body. To improve the efficiency of work, and reduce mental stress. Ultra-Low Frequency Schumann wave generator, features high accuracy and stability. Adopting anti-vibration technology to stabilize the frequency. Made from high stability pulse chip, precision correction capacitance, and precision multi-loop adjustable resistor. With work condition indicator (red, green or frequency flashing blue), you can clearly see its work conditions. Rechargeable large capacity lithium battery can last about 400 days at a time when fully charged. Functions: For audio-visual space - to enhance the sound field and audio-visual effects. For the bedroom - to help sleep soothe the nerves, treatment of insomnia. For the office - to relax and improve work efficiency. For the create space - to improve creative inspiration. For the tea ceremony, spirituality, realization space - to rest body and mind. Specifications: Frequency: 7.83Hz Rated voltage: DC 5V Net Weight: 270g Package size: 16*15*7cm Packing List: 1 * Schumann Resonance Pulse Generator 1 * Power Supply