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. Output 7.83HZ pulse square, whose duty cycle is 50%. Frequency can be fine-tuned for correction. Made from high stability pulse chip, precision correction capacitance, and precision multi-loop adjustable resistor. USB port power supply, typically+5V 0.1A. 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 Power supply:+5V Current: 0.1A Net Weight: 60g Package size: 16*15*7cm Packing List: 1 * Schumann Resonance Pulse Generator 1 * USB cable