Features: Brand new and high quality This product is a Schumann 7.83HZ ultra-low frequency generator with high precision and stability. Power has almost no voltage Schumann ultra-low frequency pulse generator and audio resonators include highly stable frequency acquisition components, highly stable pulse chips, precision corrected capacitors, precision multi-loop adjustable resistors and SSD capacitors, all of which ensure accuracy and precision. Work and durability. Schumann resonance generator can help people relax. It helps to improve the body's perception of sound and image. It also helps to improve people's health, improve work efficiency and mental state, and improve stress. This pulse generator is compact and portable and powered by an 850 mAh battery. Its small size makes it perfect to use anywhere. Elevate your experience with this innovative pulse generator. Experiment with different settings and distances to achieve the perfect sound quality for your listening. Specifications: Material: Metal Size: Approx. 68x52x12mm/2.56x2.04x0.47inches Power : 5V micro USB Battery: 850 mah Charging current: 250ma Operating current: 7MA Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1x Schumann Generator