Feature 1Stable Performance: Adopting high stability pulse chip, accuracy correction capacitor, accuracy multi loop adjustable resistor, and display capacitor to ensure high work accuracy. 2Circuit Protection: The 7.83HZ ultra low frequency generator has high accuracy and good stability, with overcharge, overvoltage, overcurrent protection, and no voltage ripple. 3Multiple Functions: Schumann wave can help people relax physically and mentally, improve the body perception of sound and image, improve work efficiency and mental state. 4Power Supply Method: The schumann wave generator has built in 850mAh polymer lithium battery, the Micro USB interface for charging, making it easy to use anytime, anywhere. 5Applicable Scenes: The schumann resonance pulse generator is widely used in daily life, suitable for nighttime sleep, daily relaxation, meditation, massage, and fitness scenarios.Item Type: Schumann Wave GeneratorMaterial: PCBProduct Size: Approx. 68 x 52 x 12mm / 2.7 x 2 x 0.5inPower Supply: 5V Micro USB Charging Cable for Android InterfaceBattery: 1 x 3.7V Polymer Lithium Battery, Capacity: 850mAh (built in battery)Usage Time: Charging current 250mA, about 6 hours to fully charge, working current about 7MA, can be used for about 200 hours (168 hours per week) when fully charged .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Schumann Wave Generator1 x Data Cable1 x Storage BoxNoteDo not tear off the protective film, disassemble and touch the components when trying the product.