Features: Brand new and high quality This product is a Schumann 7.83HZ ultra low frequency generator with high precisions and stability. The power supply has almost no voltage The Schumann ultra-low frequency pulse generator and sound resonators include high-stability frequency acquisition components, high-stability pulse chips, precisions corrected capacitors, precisions multiloop adjustable resistors, and SSD capacitors, all of which ensure accuracy and precisions. Work and durability. Schumann resonance generator can help people relax. It helps to improve the body's perception of sound and images. It also helps to improve human health, improve work efficiency and mental state, and improve stress. Compact and portable, this pulse generator is powered by a 850mAh battery.Its small size makes it perfect for use anywhere. ElevateS your experience with this innovative pulse generator. Experiment with different settings and distances to achieve the perfect sound quality for your listen pleasure. Specifications: Material:Metal Size:Approx. 68x52x12mm/2.56x2.04x0.47inch Power supply: 5V micro usb Battery: 850mah Charging current: 250ma Operating current: 7MA Package Includes: 1x Schumann Generator 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.