Extremely Low Frequency Pulse Resonance Improves The Sound Quality Of Water Deep Sleep $ 7.35 Specifications: Trade name: Schuman generator Overall size: 82mmx100mm Spiral disc diameter: 82mm Power supply: Type-c charging port Resonant frequency: 7.8hz(adjustable) No battery can not be charged, connect usb cable power supply Package list: Generator1 +usb1
