Feature:1. STABLE AND EFFECTIVE: The size of the schumann resonance generator is 16.5x13x3.5cm, and the frequency of ultra low frequency pulse wave is more stable. The specific ultra low frequency wave of 7.83Hz is helpful to improve sleep, relieve fatigue and restore physical and mental health2. SUITABLE CONTAINERS: Schumann resonance generator is suitable for filling water with glass, porcelain, iron, etc. Aluminum, copper and other products can not be used, because aluminum, copper and other products can not let the low frequency of 7.83HZ through the container3. BENEFIT TO HEALTH: The schumann wave generator benefit people physical and mental relaxation, improve body perception of sound and images, and improve health of human body4. ACCURATE AND STABLE: Ultra low frequency schuman wave generator has high accuracy, good stability, can improve work efficiency, reduce mental pressure5. WITH INDICATOR: The schumann wave generator has an operating status indicator(red, green, or blue with frequency blinking) so that you can clearly see operating statusSpecification:Item Type: Schumann Resonance GeneratorCharging Method: 1 x Rechargeable lithium battery 2000mA, using the common Type C interface of mobile phones to chargePower Voltage: 5V 1AFrequency: 7.83HZSize: Approx. 16.5 x 13 x 3.5cm / 6.5 x 5.1 x 1.4in.Package List:1 x Schumann Wave Generator1 x USB Cable