7.8Hz Schumann waves pulse generator has high accuracy and nice stability, which can make you relax and reduce mental stress and is beneficial to human health. Features: 7.8Hz ultra-low frequency pulse Schumann generator has high accuracy and nice stability. Equipped with high stability pulse chip, accuracy correction capacitor and multi-loop adjustable resistor. It can turn ordinary water into Shumangbo water, antioxidant, easy to absorb, and improve the oxygen delivery capacity of bloods after drinking, which is beneficial to health. It can be placed in the bedroom to improve the quality of sleep, or in the office to relax and improve work efficiency. Used to make the sound more pleasing, or used to make tea to speed up the brewing and make the tea smell more intense. USB plug and play, easy to use, can be used in the bedroom, study, office, tea room, etc. Specifications: Color: Black Material: Plastics Power Supplys: Type-C Port Resonant Frequency: 7.8Hz (Adjustable) Item Size: 100 x 82mm or 3.9 x 3.2in Item Weight: 18g or 0.6oz Package Size: 130 x 85 x 10mm or 5.1 x 3.3 x 0.4in Package Weight: 24g or 0.8oz Packing List: 1 x Schumann Resonance Generator